题目内容

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

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

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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

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A. type
B. are typing
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Are, washing
B. Is, washing
C. Do, wash