{01}He ________ the problem, but failed. A.tried to solve B.managed to solve C.managed solve D.tried solve 解析: 本题选A。 {02}This was a serious accident ________ by unexperienced workers. A.caused B.was caused C.to be caused D.being caused 解析:caused by...workers为过去分词作后置定语。 本题选A。
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