My supervisor is angry with me. I didn't do all the work I ____ last week.

Question

A. should have doneB. may have doneC. need to have doneD. must have doneThe correct answer is A but I don't understand why we don't choose D?Thank you very much!

IELTS instructor · Accepted Answer

The correct answer is definetely A.

Must is used in 3 different ways:

1. You can use must to say that you believe something is certain. (He must be joking)
2. For the past we use must have to say that you believe something was certain. (I didn't hear the phone. I must have been asleep)
3. Must is similar to have to. (I must phone her or I have to phone her)

You shoud have done something = you didn't do it, but it would have been right thing to do. ( You missed a great party last night. You should have come )

CalifJim · Answer

Please put the example within the text of your post, and not in the header.

Mông Lung LinhI don't understand why we don't choose D

We don't choose D because it doesn't make sense at all. Here's what it means:

I didn't do all the work (that) I must have done last week.
=
The only logical conclusion is that I did all the work, but I didn't do all the work.
=
It is not possible that I did not do all the work, but I did not do all the work.

If you already know that something is impossible to do, then you can't claim that you did it.
It's like saying, It's not possible for me to visit the planet Mars, but I visited Mars last week.
It doesn't make sense.

CJ

Mông Lung Linh · Answer

Thank you very much!

My supervisor is angry with me. I didn't do all the work I ____ last week.

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