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

It won’t be safe to use these stairs __________.

A. before they repairs them

B. after they will repair them

C. when they repaired them

D. until they have them repaired

Đáp án
D. until they have them repaired

Câu hỏi thuộc Bài tập:

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