问题补充:
It was on October 1st new China was founded.
A. which
B. that
C. when
D. as
答案:
A. which
(答案→)B. that
C. when
D. as
解析:题目中含有It was,出现这样的结构,首先要考虑它是不是强调句。如果把这种句型结构划掉后,应该是一个完整无缺的句子;这也是判断强调句型与其它从句的方法。假设它是强调句,去掉it was和空格处,剩下的句子经过调整语序后变成New China was founded on October 1st是一个完整的句子,所以是强调句型,对时间状语进行强调。强调句的结构It is/was+被强调部分 + that + 句子的其他成分,如果被强调的部分是人,可以用who代替that。