2019年mpacc考试英语真题——连词1273

{01 ________ nearly all behavior is learned behavior is a basic assumption ________ has been put forward by social scientists.

A.What; that	B.That; what
C.What; what	D.That; that

解析：D　句意：几乎所有的行为都是学来的行为是社会学家提出的基本设想。“________nearly all behavior is learned behavior”为主语从句，该从句不缺任何成分，故用that引导；“________has been put forward by social scientists”为定语从句，先行词为assumption，将先行词代入定语从句后为：The assumption has been put forward by social scientists.由此可见先行词在定语从句中作主语，故用that引导。
本题选D。
{02}(2013·潍坊高考模拟)Air pollution is getting more and more serious，so we must take action________it is too late.

A.before	B.after
C.until	D.when

解析：考查状语从句。句意为：空气污染越来越严重，所以我们必须趁现在还来得及的时候采取行动。根据句意可知，应用before，表示“在……以前”。
答案：　A
本题选A。