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

Đáp án
A. was examining / was waiting

Câu hỏi thuộc Bài tập:

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