Mary found it hard to concentrate on her work because the noise

Câu hỏi :

Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction.

A. it hard 

B. to concentrate 

C. work  

D. because the noise

* Đáp án

* Hướng dẫn giải

Đáp án là D

because the noise => because of the noise, vì because + clause, còn because of + N

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