— Theres someone outside. Who it be ?— It must be Mary. She promised to come over at 8:

发布时间：2020-08-17 15:15:56

— There's someone outside. Who it be ?
— It must be Mary. She promised to e over at 8: 00.
A. must
B. can
C. shall
D. need

网友回答

A. must
(答案→)B. can
C. shall
D. need
解析：情态动词 can 表示推测，用于疑问句和否定句。
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