问题
选择题
He tried his best to solve the problem, _____ difficult it was.
A．however
B．no matter
C．whatever
D．although
答案
答案：A
考查让步状语从句。因为difficult是形容词，所以用how对它进行强调。B选项应该加how;句意：无论有多么困难，他总是努力解决这个问题。
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