题目内容
— There's someone outside. Who it be ?
— It must be Mary. She promised to come over at 8: 00.
— 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。
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