—What is behind the tree?
—There must be a dog ______ there.

A. to sit
B. sit
C. sitting
C
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科目:初中英語 來源:專項(xiàng)題 題型:單選題

—What is behind the tree?
—There must be a dog ______ there.
[     ]
A. to sit
B. sit
C. sitting

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