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----- Why is Mr . Yang still in the teachers’office ?
---- Maybe he _______ his work yet .
A.doesn’t finishB.hasn’t finished
C.haven’t finishedD.won’t finish
B

试题分析:句意:为什么杨先生还在办公室?也许他还没有完成他的工作呢。由yet可知该用现在完成时,所以选B。
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