MODULE 10 - Đại từ nhân xưng, Đại từ sở hữu và Đại từ phản thân
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John was sacked last year. He ______ harder. A. may have worked B. should have worked C. must have worked D. should be working

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John was sacked last year. He ______ harder.

may have worked

should have worked

must have worked

should be working

Giải thích

Chọn đáp án B