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

Can you be quieter? I ______to concentrate.

A. am trying

B. try

C. is trying to

D. are trying

Đáp án
A. am trying

Câu hỏi thuộc Bài tập:

UNIT 10: ENERGY SOURCES TEST 02