EXERCISE 5.

Câu hỏi

CÂU 1. I was exhausted because I _______ for the exam all night.

A. had studied

B. had been studying

C. was studying

D. studied

Đáp án
B. had been studying

Câu hỏi thuộc Bài tập:

FRIENDS GLOBAL 12 - UNIT 5 - VOCABULARY AND GRAMMAR