They stayed for hours, ______ my mother was very annoyed about.

Câu hỏi :

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

A. that

B. this 

C. which 

D. whom

* Đáp án

C

* Hướng dẫn giải

Đáp án C

Which: bổ sung cho ý đứng trước

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