非谓语动词的完成时形式to have done或having done强调该动作发生在句子谓语动词之前 例5. __ to reach them on the phone, we sent an email instead. A. Fail B. Failed C. To fail D. Having failed 解析:根据句意“我们没有打通电话,就给他们发了个邮件”,没有打...
To do 表示将要去做(主动语态) To be done 表示将要被(被动语态) Doing 正在做某事(主动语态) Being done 正在被(现在分词的被动) Done 做完某事(被动语态) Having done 做完某事(主动...
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