摘要： He tried his best to solve the problem, however d it was.
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He tried his best to solve the problem，_____difficult it was.
A however B. no matter C. whatever D. although
查看习题详情和答案>>He tried his best to solve the problem,________ difficult it was.
A.however B.no matter
C.whatever D.although
查看习题详情和答案>>He tried his best to solve the problem，_____difficult it was.
A however B. no matter C. whatever D. although
查看习题详情和答案>>