【題目】He tried his best to solve the problem, __________ difficult it was.
A.however
B.no matter
C.whatever
D.although

【答案】A
【解析】A. however無(wú)論如何....；B. no matter無(wú)論；C. whatever連詞，無(wú)論什么；D. although盡管；句意：無(wú)論它是多么的難，他都盡力解決這個(gè)問(wèn)題。根據(jù)句意，故選A。

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