30．It was not until midnight ________ we got home because of traffic jams.
A. when B. that
C. while D. as
[解析]本题考查强调句型。句意：因为交通拥挤，我们直到午夜才到家。本题考查 not until 的强调句型。由其基本句式结构：It is/was not until...＋that...可知B项正确。
[答案]B
31．—Do you know ________ the 2011 Xiamen International Marathon was held?
—On January 2.
A. when it was that B. when was it that
C. what it was that D. what was it that
[解析]本题考查强调句型。句意：—你知道2011年厦门国际马拉松比赛是在什么时候举行的吗？—1月2日。由句意可知，此处应强调句子的时间状语，排除C、D两项；强调句的特殊疑问句结构用于宾语从句，需用陈述语序，故A项正确。
[答案]A
