{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。
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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