—Mr. Wang, must I come again to clean the window on Sunday morning?—No, you _____ . I have asked others to do it.

题型：单选题题类：模拟题难易度：普通

—Mr. Wang, must I come again to clean the window on Sunday morning?
—No, you _____ . I have asked others to do it.

A、don't have to B、mustn't C、can't D、shouldn't

举一反三

— It ___________ be him. He has gone to America.

—No, you _________. You can finish your homework first.

—Sorry, I_______. I take care of my little sister because my mother is out.

—It ________be her. Because I saw her go home a moment ago.

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