问题
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 lying
B:this is the first time he has lied
C:is this the first time has he lied
D:is this the first time he has lied
B:this is the first time he has lied
C:is this the first time has he lied
D:is this the first time he has lied
正确答案是：
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