一道英语定语从句题,The English subject,__I have mastered well,is important in middle school.A./ B.at which C.that D.in which我总觉得应该填which,可是没有这个选项.请问选什么?

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一道英语定语从句题,The English subject,__I have mastered well,is important in middle school.A./ B.at which C.that D.in which我总觉得应该填which,可是没有这个选项.请问选什么?
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一道英语定语从句题,The English subject,__I have mastered well,is important in middle school.A./ B.at which C.that D.in which我总觉得应该填which,可是没有这个选项.请问选什么?
一道英语定语从句题,
The English subject,__I have mastered well,is important in middle school.
A./ B.at which C.that D.in which
我总觉得应该填which,可是没有这个选项.
请问选什么?

一道英语定语从句题,The English subject,__I have mastered well,is important in middle school.A./ B.at which C.that D.in which我总觉得应该填which,可是没有这个选项.请问选什么?
正确答案应为:which
(which 引导非限制性定从,指代The English subject,在定从中作宾语)
__I have mastered well是非限制性定从,排除C.因为that不能引导非限制性定从.
master为及物动词,必须带宾语.因此排除BD
A貌似正确,实则不然,虽然关系代词作宾语时,可以省略,那是在限制性定从中的情况;
而非限制性定从中的关系代词不能省略.省略了就不是定从了.因此A也不正确.