◎ 题干
It is obvious that on no account _____ to the teacher that he has done the homework on his own.
A.this is the first time he is lyingB.this is the first time he has lied
C.is this the first time has he liedD.is this the first time he has lied
◎ 答案
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◎ 解析
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◎ 知识点
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