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题型：单选题题类：模拟题难易度：普通

– Have you decided how to spend your next day off?
– Not yet. We ________ join the school volunteer project.

A、may B、should C、must

举一反三

— Excuse me, _____ I borrow this book?

— Of course.

—Must I go to bed before 9：30 p.m.?

—

I must __________ my school ID card. Can you help me？

This book _________ be Lucy's. Look! Her name is on it.

— I can't find my phone anywhere.

— You have lost it while shopping.

—Jack, I hear the sports meeting ______ next week. What's all this about?

—Oh? I'm not sure. But there ______ be something important happening.

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