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

Câu hỏi

They __________ a lot of valuable experience last summer during their trip to the rural area.

A. gained

B. have gained

C. had gained

D. gain

Đáp án
A. gained

Câu hỏi thuộc Bài tập:

Ôn thi vào lớp 10 - Đề 1