英语三级A级

单选题 Between 1975 and 1996, the number of overseas visitors expanded __________27%on average each year.

A．in
B．by
C．for
D．to

参考答案：B进入在线模考
【答案】B
【译文】在1975到1996年间，海外游客的数量以平均每年27％的速度增长。  
【考点】介词的用法
【解析】expand by．．．％表示“以某种百分比增长”，故选B。

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