Tim asked Sarah ________ English so far. A. she had been learning how long B. how long was she learning C. how long she has been learning D. how long she had been learning

Tim asked Sarah ________ English so far.

A. she had been learning how long 
B. how long was she learning
C. how long she has been learning     
D. how long she had been learning

Trả lời

Chọn đáp án D

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