Little have people done to alleviate the sea pollution caused by the factories in

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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.

Little have people done to alleviate the sea pollution caused by the factories in central Vietnam, haven’t they?

have people done

caused

in central

haven’t they

Giải thích

Đáp án D

Sửa haven’t they have they vì « litttle » mang nghĩa phủ định nên phần đuôi phải là dạng khẳng định