Câu hỏi :

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the   correct answer to each of the questions.

A. reverse

B. advance

C. block

D. Support

* Đáp án

* Hướng dẫn giải

Đáp án : D

Back up = support = hỗ trợ, ủng hộ

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