.every student helped the old woman to live through the cold winter. A．By turn B

________，every student helped the old woman to live through the cold winter.

A．By turn B．In turn

C．Take turns D．In return

试题答案

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。