Choose the best option to complete each of the following sentences.

Câu hỏi

Mary and her friends__________up litter in a street at 4 p.m. yesterday.

A. picked

B. was picking

C. is picking

D. were picking

Đáp án
D. were picking

Câu hỏi thuộc Bài tập:

Ms. Dung Purple - Unit 4: For a Better Community - Grammar