Last year there were many problems which____by bad weather A

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Last year there were many problems which____by bad weather A.caused B.was caused C.were caused

答案：C.were caused .
分析：Last year there were many problems which were caused by bad weather.
去年有很多因为气候引起的问题.which were caused =caused.
再问： why - -?
再答：已经修改了，嗯。which引出定语，没有which的话选A.caused 。

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