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The two things _____ he wasn't sure were the grammar and the

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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 )