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.why - -?已经修改了，嗯。which引出定语，没有which的话选A.caused 。
Last year there were many problems which____by bad weather A.caused B.was caused C.were caused
Last year there were many problems which____by bad weather A.caused B.was caused C.were caused
英语人气：326 ℃时间：2019-10-29 19:27:14
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