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长期饮酒主要损害人的哪三个器官？

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加压包扎止血法一般用于哪三个部位的出血？

Must Amy _____ the floor?

A. sweeping
B. sweep
C. is sweeping

---Where _ the dog _ (run)? ---It is running across the grass.

A. does, run
B. are, running
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We mustn't ______ off the wall.

A. jump
B. be jumping
C. are jumping