问题补充：
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
答案：
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
(答案→)D. is this the first time he has lied
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