It is because English is very useful_____A.at which we work hard B.that we work hard at itC.which we work hard at D.wjich we work hard

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It is because English is very useful_____A.at which we work hard B.that we work hard at itC.which we work hard at D.wjich we work hard

It is because English is very useful_____A.at which we work hard B.that we work hard at itC.which we work hard at D.wjich we work hard
It is because English is very useful_____
A.at which we work hard B.that we work hard at it
C.which we work hard at D.wjich we work hard

It is because English is very useful_____A.at which we work hard B.that we work hard at itC.which we work hard at D.wjich we work hard
B 吧..这个句子是强调句啊!It is because English is very useful that we work hard at it.
[强调句:It is/ was + 被强调部分(通常是主语、宾语或状语)+ that/ who(当强调主语且主语指人)+ 其它部分.]
强调句还有个鲜明的特点,就是把结构 It is/ was 和taht/who去掉后,句子仍成立.看看这句子,把结构去掉后变成:We work hard at it because English is very useful.很显然句子成立!

B It在这里是形式主语,而that引导的从句才是真正的主语。这句话如果直译的话应该是这样的:我们刻苦学习英语是因为英语很难。

a

B