— There's someone knocking on the door. Who _____it be? — It must be Mary. She promised to be here a...
2022-12-08 14:04:16 207次 2012-2013学年四川宜宾高三一诊考试英语卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
— There's someone knocking on the door. Who _____it
be?
— It
must be Mary. She promised to be here at 8：00.
A.must B. need C. shall D.
Can
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