-what’s behind the door? -There must be a dog behind it. A. to sit B. sit C. sat D. sit——青夏教育精英家教网—

摘要：-what’s behind the door? -There must be a dog behind it. A. to sit B. sit C. sat D. sitting B.选择方框中的动词词组并用其适当形式填空

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--What’s behind the door?

--There must be a dog _________behind it .

　　　　 A. to sit 　　　　B.sit 　　　　　　 C. sat 　　　 D. sitting

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