Wheat production _______________30% in t...

Wheat production _______________30% in the past ten years.

A. has been increased to

B. have been increased to

C. has been increased by

D. have been increased by

C 【解析】试题分析：句意：小麦生产在刚刚过去的十年里按照30%增长。此题考查现在完成时，因为有特殊标志词in the past ten years在刚刚过去的十年里和increase by以……速度增长，根据句意，应选C。考点：考查现在完成时。

考点分析：

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