________ for us? A. How has she been waiting long B. Has she been waiting how long C. How long has she been waiting D. How long she has been waiting

_______ for us?

A. How has she been waiting long 
B. Has she been waiting how long
C. How long has she been waiting   
D. How long she has been waiting

Trả lời

Chọn đáp án C

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