问题描述：
（1）They ()there a moment ago A.is B.was c.were （2）Before 1979,shenzhen（）a small town.A.is B
A.is B.was c.were
（4）There （）always a lot of traffic in shenzhen
A.is B.was C.are
A.is B.was c.were
（4）There （）always a lot of traffic in shenzhen
A.is B.was C.are
问题解答：
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