【題目】It sounded like a good idea, but _______it didn’t work.

A. on average B. in theory

C. in practice D. on the spot

【答案】C

【解析】

試題分析： C考查介詞短語， A. on average 平均，B. in theory理論上， C. in practice 操作上，D. on the spot在現(xiàn)場。根據(jù)句意“這個聽起來是一個好主意，但是操作起來是無效的。”，所以答案選C。

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