While the doctor ________ Mr. Jones, his son ________ outside this morning. A. was examining / was waiting B. will be examining / are waiting C. had been examining / was waiting D. are exam

While the doctor ________ Mr. Jones, his son ________ outside this morning.

A. was examining / was waiting    
B. will be examining / are waiting
C. had been examining / was waiting  
D. are examining / is going to wait

Trả lời

Chọn đáp án A

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