题目内容

Must Amy _____ the floor?

A. sweeping
B. sweep
C. is sweeping

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

A. does, run
B. are, running
C. is , running

We mustn't ______ off the wall.

A. jump
B. be jumping
C. are jumping

Look! The aeroplane ________ over the river.

A. flying
B. is flying
C. fly

It is eight o'clock. The keyboard operator ________ a letter.

A. type
B. are typing
C. is typing

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