He tried his best to solve the problem,______ difficult it was
A.however B.no matter C.whatever D.although
请问答案是A,请问别的为什么不行?
人气：100 ℃ 时间：2019-11-19 08:02:52
解答
however = no matter how
句子意思是：无论这个问题有多难,他都尽力去解决它.
B选项差疑问词how
C选项= no matter what,疑问词不对
D后面要接句子,不能接形容词
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