Someone is knocking at the door._ it be Venis?—No,it _ b

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Someone is knocking at the door.___ it be Venis?—No,it ___ be her; she l
Someone is knocking at the door.___ it be Venis?
—No,it ___ be her； she left for New York this morning.
A.Can； mustn’t B.Might； can’t
C.May； doesn’t D.Can； can’t
为什么不选B 时态不对吗?如果改为may ；mustn't可以选吗?

正确答案是D吧
这是一道选择最佳答案的题目.can用在疑问句和否定句中,表示可能性的推测.can’t表示“不可能”
may,might表推测时,可以用于否定句,意思是“可能不、也许不”,但不用于疑问句.所以第一个空排除B、C .
must表推测只能用于肯定句.如果要表示“一定不、肯定不”的意思时,应用can`t.

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