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摘要：A.on B.in C.of D.at

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His birthday is______ September 4th.

A. on
B. in
C. of
D. at

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We should protect the animals ______ danger.

A. on B. in C. of D. at

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The birds are singing ____________ the tree.

A. on B. in C. of D. at

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The birds are singing ____________ the tree.

A. on B. in C. of D. at

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We should protect the animals _______ danger.

A. on
B. in
C. of
D. at

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