【題目】 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

【答案】C

【解析】

試題分析：句意：小麥生產(chǎn)在剛剛過去的十年里按照30%增長。此題考查現(xiàn)在完成時(shí)，因?yàn)?/span>有特殊標(biāo)志詞in the past ten years在剛剛過去的十年里和increase by以……速度增長，根據(jù)句意，應(yīng)選C。

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