I have a problem___(sleep) at night.填什么?

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I have a problem___(sleep) at night.填什么?
I have a problem___(sleep) at night.填什么?

I have a problem___(sleep) at night.填什么?
sleeping
现在分词短语做problem的同位语

to sleep

Sleep

sleeping
have difficult/a problem(in)doing sth.表示做某事有困难/麻烦.