单选题：1,Look,what is in the tree?-----There is 填空bird singing there.A.the B.an c.a.D.\

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$单选题：1,Look,what is in the tree?-----There is 填空bird singing there.A.the B.an c.a.D.\$

单选题：1,Look,what is in the tree?-----There is 填空bird singing there.A.the B.an c.a.D.\
单选题：1,Look,what is in the tree?-----There is 填空bird singing there.A.the B.an c.a.D.\

单选题：1,Look,what is in the tree?-----There is 填空bird singing there.A.the B.an c.a.D.\
C .a