Between 1975 and 1996, the number of overseas visitors expanded______27% on aver

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问题 Between 1975 and 1996, the number of overseas visitors expanded______27% on average each year.

选项 A、in
B、by
C、for
D、to

答案 B

解析 expand by…％表示“以某种百分比增长”，故选B。

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