题目内容
________,every student helped the old woman to live through the cold winter.
A.By turn B.In turn
C.Take turns D.In return
B
by turns轮流,但不能说by turn;take turns也表示“轮流”,但为动词短语,不符合此处题意;in return作为报答,作为回报;in turn“轮流”符合此处用法。
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