20.Without your help,I couldn'thave finished (finish) the task last night.

分析 沒有你的幫助,昨晚我不可能完成任務(wù).

解答 51.have finished
答案是have  finished.考查虛擬語氣.根據(jù)last night可知題干是表示與過去的事實相反,主句中的謂語動詞用"would/should/might/could+have+過去分詞",故答案是have finished.

點評 本題考查用所給單詞的適當形式填空.首先要根據(jù)語境明確句意,然后再根據(jù)相關(guān)語法對所給單詞在形式上做出正確的變動.

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