题目内容

We mustn't ______ off the wall.

A. jump
B. be jumping
C. are jumping

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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

--- ______ they _____ the dishes? --- Yes, they are.

Are, washing
B. Is, washing
C. Do, wash

They ______ now.

A. is shaving
B. are shaving
C. shaving

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