皮皮学，免费搜题
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【单选题】
—What are these flowers for? —We're going to use them to _____ the Christmas tree. Would you please help us put them in the tree? [ ]A.
celebrate
B.
create
C.
decorate
D.
produce
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A.
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B.
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C.
正常条件下有利，异常条件下有害
D.
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E.
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