My friend and I always keep _______ touch by mail. When I get a letter, I usually write _______ immediately. A. off / upon B. on / about C. in / back D. by / to

My friend and I always keep _______ touch by mail. When I get a letter, I usually write _______ immediately.

A. off / upon 
B. on / about    
C. in / back  
D. by / to

Trả lời

Chọn đáp án C

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