【題目】The time is drawing near food raised in space will directly benefit human below.

A.where B.when C.whether D.why

【答案】 B

【解析】

試題分析：考察定語從句引導詞。該句是一個when引導的定語從句，先行詞是time，when在句子中做時間狀語。該句意思為：距離人們食用在太空生長的食物時間不遠了。

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