Question

【题目】— Who's that boy reading in the garden? Is it David?

— It _________ be David. I saw him in the classroom just now.

A.mustB.can'tC.may

Answer 1

【答案】B

【解析】

句意：——那个在花园里读书的男孩是谁?这是大卫吗?——不可能是大卫。我刚才看见他在教室里。

考查情态动词。must必须；can't不可能；may可以；根据“I saw him in the classroom just now.”可知我刚才看见他在教室里，可推测出此处是“不可能”，故选B。