题目内容
19．-Why are you late，Jim？-Because there a lot of traffic when I came here．（ ）
| A． | is | B． | are | C． | was | D． | were |
分析 --吉姆，你为什么迟到了？
--因为当我往这里的时候路上（交通）很拥挤．
解答 答案：C 根据 traffic-不可数，排除B和D；根据when I came here时态是一般过去时，所以排除A．故选C
点评 there be 结构中的be选用要根据be后面的词语的人称、单复数和时态来选．be包括am，is，are，was，were和been．一般现在时用am，is，are；一般过去时用was，were；用been时时态是现在完成时、过去完成时等时态．
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