When he was a little boy, Mark Twain would walk (A) along the piers, watch (B) the

Câu hỏi :

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

A. would walk

B. watch

C. swimming

D. the

* Đáp án

* Hướng dẫn giải

C

“swimming” -> “swim”

“would + động từ nguyên thể”. Phía trước và phía sau đều dùng động từ nguyên thể: walk, watch, fish

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