分析 could have been avoided
解答 答案:could have been avoided.
本句是對過去事實的虛擬,從句用had done,主句用could/should/might have done,failure與avoid之間為邏輯上的被動關(guān)系,所以用被動結(jié)構(gòu);故答案為could have been avoided.
點評 虛擬語氣的用法:1.對現(xiàn)在的虛擬:if+過去式,主句:would (should,might,could )+do;
2.對過去的虛擬:if+過去完成式,主句:would ( should,might,could )+have done;
3.對將來的虛擬:if+did/were to do/should do,主句:would (should,might,could )+do.
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