He tried his best to solve the problem, difficult it wasA.howeverB.no matterC.wh
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He tried his best to solve the problem, ______ difficult it was
A.however
B.no matter
C.whatever
D.although
试题答案
A
解析：四个选项分别表示然而可是、不论怎样、无论什么和尽管，根据题意选A，他尽了最大努力解决问题，可是困难依旧。