He tried his best to solve the problem, ________ difficult it was． A. however B. no matter C. whatev...
2022-11-17 23:22:37 70次 2016届山东省淄博市高一5月考英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
He tried his best to solve the problem, ________ difficult it was．
A. however B. no matter
C. whatever D. although
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