【题目】The math problem was the most difficult one I had ever met, but I________to work it out at last.
A.tried
B.managed
C.succeeded
D.failed

【答案】B
【解析】考查动词词义和用法上的区别。try to do“努力做；企图做”；manage to do“设法做成”； succeed(in)doing等于manage to do“强调成功做到(着重结果)”；fail to do“失败；没做到”。