他们试图想出一个能够提前完成任务的计划.
by是介词,关系代词紧跟在介词之后时,不能用that,指物时只能用which,指人时只能用whom.而且不能省略.
但如果介词移到后面,则可以用that.而且,由于介词后面的成分叫宾语,关系代词作宾语时,只要不是紧跟在介词之后就可以省略.
上例可以说成：
They tried to think of a plan which/that they could fulfil their task by ahead of time.
或They tried to think of a plan they could fulfil their task by ahead of time.
定语从句问题.they tried to think of a plan (by which ) they could fulfil their task ahead of time
定语从句问题.they tried to think of a plan (by which ) they could fulfil their task ahead of time
为什么不用that
为什么不用that
英语人气：747 ℃时间：2019-10-14 21:37:54
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