题目内容

____ not ____ that tree.

A. Is, climbing
B. Do, climb
C. Are, climbing

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Are they _____ a bus at the bus stop?

A. wait for
B. waiting
C. waiting for

You must _____ the tap. (关上水龙头)

A. turn off
B. turn on
C. turn down

The housewives are ____ now.

A. washing
B. washing the dishes
C. wash the dishes

Are they ____ the wall?

A. jump
B. jump off
C. jumping off

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