问题
选择题
— There's someone outside. Who it be ?
— It must be Mary. She promised to come over at 8: 00.
A．must
B．can
C．shall
D．need
答案
B
情态动词 can 表示推测，用于疑问句和否定句。
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— There's someone outside. Who it be ?
— It must be Mary. She promised to come over at 8: 00.
A．must
B．can
C．shall
D．need
B
情态动词 can 表示推测，用于疑问句和否定句。