非谓语动词单选It's necessary to be prepared for a job interview.___the answers ready will be of great help问什么选having不能选having had非谓语动词having done啊可以做主语的,为什么

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非谓语动词单选It's necessary to be prepared for a job interview.___the answers ready will be of great help问什么选having不能选having had非谓语动词having done啊可以做主语的,为什么
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非谓语动词单选It's necessary to be prepared for a job interview.___the answers ready will be of great help问什么选having不能选having had非谓语动词having done啊可以做主语的,为什么
非谓语动词单选
It's necessary to be prepared for a job interview.___the answers ready will be of great help问什么选having不能选having had
非谓语动词having done啊可以做主语的,为什么

非谓语动词单选It's necessary to be prepared for a job interview.___the answers ready will be of great help问什么选having不能选having had非谓语动词having done啊可以做主语的,为什么
因为做主语,所以have用动名词having的形式
因为不表示完成,所以后面无需加had

只是陈述一件事。没必要用完成时。因为并没有强调已经做完。仅仅是说需要去做。

非谓语结构 1.doing 2.being done
3.having done
4.having been done
5.done
4.,5.要有明显的时态,句中没有完成时标志

不是完成时态。