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英语填空David failed in the English test .As a good friend ,I re

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英语填空
David failed in the English test .As a good friend ,I regret ( )him enough help.
1、did not offer
2、not to offer
3、not having offered
4、not to have offered
请说明原因
正确答案:3、not having offered
原因:1.regret在表达后悔做过某事事要加动名词而不是不定式,故1.2.4排除.
2.帮David应该发生在过去(David failed in the English test )的过去(就是考试之前),所以应该选现在完成时态,1.2排除.