The two things _____ he wasn't sure were the grammar and the idioms.A. about whichB. about that C. in whichD. at which选择哪一个?为什么?
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The two things _____ he wasn't sure were the grammar and the idioms.
A. about whichB. about that
C. in whichD. at which
选择哪一个?为什么?
A
定语从句 be sure about 对.有把握 缺个about 所以从 A,B 中选
再,介词前置,不可用that 所以选A
请及时采纳,不懂继续问( 天天在线 )
A 引导词前如果有介词不能用that
be sure about sth介词about提前
选A。
be sure about sth.属于短语的固定搭配。因为是一个定语从句,且包含介词,所以不能用about that。
A
be sure about 对某事肯定、确认(但没有be sure at/in的结构)
这是定语从句,先行词是things,将其还原到后面的定语从句中看充当什么成分:
he wasn't sure (about the things)
有介词后面的引导词必须用which,that不可以,A正确
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