I do not know why this room is always so dirty. It _______ every morning. A. must be cleaning B. needn’t be cleaned C. should be cleaned D. must clean

I do not know why this room is always so dirty. It _______ every morning.

A. must be cleaning       
B. needn’t be cleaned
C. should be cleaned   
D. must clean

Trả lời

Chọn đáp án C

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