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题型：单选题题类：真题难易度：普通

–Whose dictionary is this?—It be Jack's. Here's his name.

A、must B、mustn't C、can D、can't

举一反三

— It seems that Mr. Wu is standing there.
— It ______ be him because he called me from Canada just now.

—___________ you swim? —No, I___________.

The river is too deep. You __________ be careful.

—May I borrow your books?

—Yes, you .

—_______ the man there be our English teacher?

—He _______ be, but I'm not sure.

The designer has tried every possible way to make the robot light， so you _____ worry about its weight.

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