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When I entered the room, I saw him _____ in a front seat staring at a picture in a strange way. A.to sit B.is sitting C.sat D.sitting

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理解问题When I entered the room, I saw him _____ in a front seat staring at a picture in a strange way. A.to sit B.is sitting C.sat D.sitting

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When I entered the room, I saw him _____ in a front seat staring at a picture in a strange way. A.to sit B.is sitting C.sat D.sitting
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When I entered the room, I saw him _____ in a front seat staring at a picture in a strange way. A.to sit B.is sitting C.sat D.sitting
What is the correct form of the verb to use after "saw"?
What is the difference between "sit" and "sitting"?
How to use the present participle in a sentence?

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