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

Câu hỏi

All the kids their homework when the volunteer team .

A. were doing - arrived

B. did - arrived

C. were doing — were arriving

D. did - were arriving

Đáp án
A. were doing - arrived

Câu hỏi thuộc Bài tập:

All the kids ____ their homework when the volunteer team ____.