分析 could have been avoided
解答 答案:could have been avoided.
本句是對(duì)過(guò)去事實(shí)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(dòng)關(guān)系,所以用被動(dòng)結(jié)構(gòu);故答案為could have been avoided.
點(diǎn)評(píng) 虛擬語(yǔ)氣的用法:1.對(duì)現(xiàn)在的虛擬:if+過(guò)去式,主句:would (should,might,could )+do;
2.對(duì)過(guò)去的虛擬:if+過(guò)去完成式,主句:would ( should,might,could )+have done;
3.對(duì)將來(lái)的虛擬:if+did/were to do/should do,主句:would (should,might,could )+do.
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