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18．-What's that in the tree，can you see？
-There must ____ some birds ___ in it．（　　）
A．are； sittingB．be； sitC．have；sittingD．be；sitting

分析 ---樹上是什么，你能看見嗎？
---肯定是一些鳥在上面．

解答 答案：D．這里是表達肯定猜測故用must be，結(jié)合there be sb/sth doing sth有…正在做某事，故答案是D．

點評 there be sb/sth doing sth表示某地有某人或某物正在做某事，如：There is a car collecting the rubbish over there．There are some people picking apples on the farm．

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