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—Be careful! Don't forget you are on a ladder.

—But you are holding it for me, nothing ________.

A.worry about 

B.to worry about

C.is worried about 

D.worrying about

B

句意:——小心点。别忘了你在梯子上。——但是你扶着呢,没什么可担心的。不定式to worry about作后置定语。

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