Mark the letter A, B, C, or on your answer sheet lo indicate the corrected answer to each other following questions.

Câu hỏi

Bill's mother won't let him go out with his friends ______.

A. when he finished his homework

B. after he had finished his homework

C. once he finished his homework

D. until he has finished his homework

Đáp án
D. until he has finished his homework

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