Bộ 20 đề thi Tiếng Anh vào 10 có đáp án cực hay (Đề 7)

One reason birds have been so successful is because of their able to escape from danger quickly.

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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.

One reason birds have been so successful is because of their able to escape from danger quickly.

have been

because of

able

from

Giải thích

Đáp án C