Who is a millionaire?

Choose the most correct answer.

Câu hỏi

Question 5 : Sandy................her homework for 4 hours without stopping.

A. A has done

B. B has been doing

C. C have been doing

D. D has been done

Đáp án
B. B has been doing

Câu hỏi thuộc Bài tập:

Distinguish between the usage of the present perfect continuous tense and the present perfect tense.