I. Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions.

Câu hỏi

While I to work this morning I an old friend.

A. went / meet

B. am going / met

C. go / was meeting

D. was going / met

Đáp án
D. was going / met

Câu hỏi thuộc Bài tập:

While I ____ to work this morning I ____ an old friend.