摘要： There are many apples the tree. A bird the tree is picking an apple. A. in, on B. on, in C. in, at D. at; in

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There are many apples the tree. A bird the tree is picking an apple.

There are many apples ________ the tree. A bird ________ the tree is picking an apple.

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There are many apples ________ the tree. A bird ________ the tree is picking an apple.