1．It wasn’t until nearly a month later ________ I received the manager’s reply.
A．since B．when C．as D．that
解析：
考查强调结构。强调句的结构是it is(was)+被强调部分+that-从句。that不能被省略。
答案：D
2．He tried his best to solve the problem, _______ difficult it was.
A．however B．no matter
C．whatever D．although
解析：
however无论什么，表示程度；B项不完整，whatever无论什么，although尽管。句意为“他尽最大的努力解决问题，无论有多么困难。”
答案：A
