一道高考题1

一道题1 Was it ________ the conference of APEC that made Shanghai the focus of the world then ?
A. holding B. to hold C. held D. having held    

参考案 同意选A
这是一个强调句式的一般疑句式.改为陈述句就是:
It was holding the conference of APEC that made Shanghai the focus of the world then.
此强调句是强调主语:holding the conference of APEC
动名词作主语.

其他回   A. holding
因为你开头已经是was了，之后的动词就不能是过去时了。then在这里是‘当时’的意思，所以应该是A。