Is Maria knocking at the door ? ------It( )be her. She is in Australia now.
问题描述：
Is Maria knocking at the door ? ------It( )be her. She is in Australia now.
A.may notB.needn'tC .mustn'tD.can't
翻译
答
C
题目的意思是 是玛丽敲的门吗?
回答应该是 一定不是她,她现在在澳大利亚
所以是C