____ they could do was to work hard.为什么不能用that?A.all B.all t

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____ they could do was to work hard.为什么不能用that?A.all B.all that C.all which D.that 选A

这道题,个人觉得A和B都应该是正确的.
首先that是可以引导主语从句的,可是在引导主语从句的时候,that没有任何含义,仅作为引导词.
比如,That light travels in straight lines is known to all.众所周知,光线沿直线运行.
接下来,我们来分析一下这句话.“他们能够做的是努力工作.”那么在此处,第一反应的词应该是what.即what they could do .
但是这里没有这个选项,那么,那个答案和what的作用是一样的呢.应该是all（that）.所以这里A和B都应该是正确的.

____ they could do was to work hard.为什么不能用that?A.all B.all t ___they could do was to work hard!A.All ( )It was ____ that nobody could finish it.A.so hard work B. In the end,all of them_______ hard work.A.got used to do B.u They spent all night ___ the work.A.do B.to do C.doing.D.don 是they work all hard还是they all work hard 请问此题咋做-----you work hard-----?A.Do,all the day B.Did,all day They were all so tired that they could ____. If you work hard ____,you won't have to sit up all night bef All I could do was to wait.So that's that __ I need to do now is to study hard.A what B all C that Dwh Do they -------return all the books?A.has to B.must C.have t