问题补充：
It is in Qingdao you’re going to pay a visit to this kind of washing machine is produced.
A. /; that
B. where; which
C. /; where
D. that; which
答案：
(答案→)A. /; that
B. where; which
C. /; where
D. that; which
解析：通过分析句子结构，可知这个句子中包含一个省略了that的定语从句和一个强调句。关系代词在定语从句中作宾语，故可以省略；因为去掉it is和that，剩下的是一个完整的句子，所以是强调句型，强调句的结构It is/was+被强调部分+that+句子的其他成分
