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题型：单选题题类：模拟题难易度：普通

Yesterday it rained heavily when school was over. So we _______ stay in our classroom.

A、should B、must C、had to

举一反三

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

– Is your brother playing computer games, Nick?
– He ________ do that because the computer doesn't work.

We _______pay to get into the concert. It's free.

— Is Jack on duty today?

— It_______ be him. It's his turn tomorrow.

You'll ___________ swim when summer comes.

—I missed last night's Everlasting Classics（《经典咏流传》）！

—You care. You can watch it online later.

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