-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 查看更多

 

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—What's behind the door?
—There must be a dog _____ behind it. 
[     ]
A. to sit    
B. sit
C. sitting    
D. to sitting

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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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