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Isthisproblemourteacherexplainedyesterday?A.whichB.thatC.thatoneD.one

题目详情
Is this problem ________ our teacher explained yesterday?
A.which B.that C.that one D.one
▼优质解答
答案和解析
C
that 是引导词,one 指代problem
如果原句是 Is this the problem ( ) our teacher explained yesterday?则( ) 可以是 that 或which