题目列表(包括答案和解析)
He tried his best to solve the problem，_____difficult it was.
A however B. no matter C. whatever D. although
He tried his best to solve the problem,________ difficult it was.
A.however B.no matter
C.whatever D.although
He tried his best to solve the problem，_____difficult it was.
A however B. no matter C. whatever D. although
He tried his best to solve the problem, _______ difficult it was.
A. whatever???????? B. however????????? C. whichever???????? D. wherever
He tried his best to solve the problem, ________ difficult it was.
A．however B．no matter C．whatever D．although
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