You look exhausted. You _______ in the garden all day.

Câu hỏi :

You look exhausted. You _______ in the garden all day.

A. must have been working

B. should have been working

C. would have been working

D. will have been working

* Đáp án

A

* Hướng dẫn giải

must have Vp2: suy đoán điều chắc hẳn đã xảy ra trong quá khứ

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