I thought I'd look in on him from time to time _____ if he needed somethingA.seeing B.seen C.to see D.saw 选什么?

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IthoughtI''dlookinonhimfromtimetotime_____ifheneededsomethingA.seeingB.seenC.toseeD.saw选什么?IthoughtI''

I thought I'd look in on him from time to time _____ if he needed somethingA.seeing B.seen C.to see D.saw 选什么?
I thought I'd look in on him from time to time _____ if he needed something
A.seeing B.seen C.to see D.saw
选什么?

I thought I'd look in on him from time to time _____ if he needed somethingA.seeing B.seen C.to see D.saw 选什么?
to see 用不定式作目地状语.