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The policemen hurried into the station_____they heard the gu

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The policemen hurried into the station_____they heard the gunshot.
A.immediately B.at once C.since D.then
When the poor man first set_____in America,he didn't know what the future might have in_____ for him.
A.his foot,the store B.a foot,the store
C.foot,store D.feet,stores
This hi-tech district,____many famous universities,is now the center for Hefei's science and technology.
A.based in B.the home for C.base for D.home to
最好能解释下为什么这么做!
The policemen hurried into the station_____they heard the gu
选 C C D
理由:1,只有c可以连接从句.此句意思是:听到枪声后,警察就往车站赶
2,set foot固定词组,中间不加冠词,意思是踏上什么地方;in store 也一样,意思是什么将要发生
3,只有home to 讲得通,其他的不应该是过去分词形式或者原形.home to 的意思是 以什么为家,或基地