5000 câu trắc nghiệm Tiếng Anh 9 có đáp án - Phần 61
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He is very cleaver and wins all the prizes _______ his brother never seems to know a thing.

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He is very cleaver and wins all the prizes _______ his brother never seems to know a thing.

and

while

therefore

or

Giải thích

Chọn đáp án B