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The factory has been closed          a year ago.

A.already

B.since

C.for

D.yet

 

【答案】

B

【解析】since引导时间状语表示“自从…”

 

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The San Diego Zoo has been a lovely home for giant pandas since two of the black-and-white bears came to visit in 1987. This week there was snow in San Diego—well, at least for a lucky group of giant pandas.
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All the San Diego Zoo’s giant pandas are from China, as part of a long-term captive breeding(人工养殖) program. Four of Xiao Liwu's brothers have already been moved from California to China.
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B.To give the pandas a chance to play.
C.To help the pandas live in their natural habitat.
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