— Look! It be Tom on the playground.

—It be him. I saw him enter the classroom just now.

A. may…mustn’t B. must…mustn’t C. must…can’t

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“It has been difficult to design robots that can work well when the environment changes or when it’s damaged,” says Olaf Sporns of Indiana University in US. “With this work, we are nearer to solving this problem.”

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