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But for your timely help, I ________ the project as scheduled.
A．couldn’t completeB．couldn’t have finishedC．can’t have finishedD．can’t finish
B
考查虛擬語氣。本題是一個含蓄的條件句，通過介詞短語but for要不是，如果沒有表示條件。通過句意可知這是一個與過去事實相反的虛擬語氣，所以使用情態(tài)動詞+have done.句意：要不是你及時幫助，我可能就不能按照計劃完成那個工程。
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