He tried his best to solve the problem , difficult it was . A. however B. no matter C. whatever D. ...
2023-02-16 01:56:11 57次 2005年高考试题（天津卷）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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