By ________ time we had just left the office, ________ alarm went off. A. Ø / the B. a / an C. a / the D. the / an

By ________ time we had just left the office, ________ alarm went off.

A. Ø / the      
B. a / an       
C. a / the    
D. the / an

Trả lời

Chọn đáp án D

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