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【題目】But for their help, we ________ the program in time.

A. can not finished B. will not finish

C. had not finished D. could not have finished

【答案】D

【解析】

考查虛擬語氣。But for“要不是......”，相當于if虛擬條件句，與過去事實相反，主句用would/should/could have done。句意“要不是他們的幫助，我們不可能及時完成計劃。”故選D。

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