Why is the answer sheet marking D as the wrong answer for question 8?

It should be "I'd have picked" as in "I would have picked" "I'd picked" could only be "I had picked" which is the wrong verb form here

D is absolutely wrong, the sentence makes no sense with D

Correct phrasing is one of: * I would have picked you up * I'd have picked you up * I would've picked you up * I'd've picked you up (informal)

*Were you to have told* is a less common, more formal way to say "If you had told me". So A is just fine.

I think it should be "I'd have picked you up."

Nobody uses such silly, stilted sentence construction like this. For the reasons others have said, yes, D needs to be fixed. But this is silly.

“Were you to have told me” is awkward but not technically wrong. (A native speaker would say “if you had told me”) D could be “I would have picked you up” or “I’d have picked you up.” Informally you can even say “I’d’ve picked you up” but it looks terrible when written

Sentence 8 is **3rd conditional**. 3rd conditional usually uses: >CONDITION CLAUSE: if + past perfect >RESULT CLAUSE: ***would have*** + past participle However, this is a slightly more formal, even archaic structure, which we call the **subjunctive**. It replaces the word 'if' and the **past perfect** in the condition clause. >CONDITION CLAUSE: ***Were*** + subject + ***to have*** + past participle >RESULT CLAUSE: (the same) ***would have*** + past participle So D is incorrect because it's missing the '***have***'.

"I'd picked you up" means "I had picked you up" which makes no sense in the context of this sentence. "I'd have picked you up" means "I would have picked you up" which makes sense so the word "have" is missing.

Because “Were you” is not incorrect, it means “If you had”. While “I’d picked you up” doesn’t fit this context, since the recipient didn’t actually tell the speaker that the train had arrived so they couldn’t have picked them up.

If you undo the contraction of I'd that would say I would picked you up or I had picked you up, which doesnt make sense. It'd have to say I would have picked you up which would be shortened to I would've picked you up

Because it needs to be in the subjunctive mood and "I'd picked you up" is in the indicative mood. In other words, it's a statement of fact about the past when it should be a statement of what the person *would have* done. The correct answer is "I'd have picked you up".