—Is that Mr Black in the playground?—It ____ be Mr Black. He's teaching English in the classroom.

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1. —Is that Mr Black in the playground?
—It ____ be Mr Black. He's teaching English in the classroom.

A . must B . can't C . could D . needn't

使用过本题的试卷

外研（新标准）版九年级下学期期中测试（一）