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题型：单选题题类：真题难易度：容易

Cars, buses, bikes and people stop when the traffic lights are red.

A、can B、may C、must

举一反三

–– ________ I come back before 6 o'clock?
–– No, you _______ . But you ______ be back later than 7 o'clock.

——Must we clean the classroom now?

——No ,you _______.

— ________ I finish my homework now?

— No, you ________.

—Must I hand in the homework now?

—No, you ______. You can give it to me tomorrow.

—Could you find_______ ways to work out this problem, Jim?

—Yes, I_______.

You sit too long. You had better take a break every 30 minutes when studying.

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