______ most of my friends wanted to do during the holiday was visit the Expo Garden

A.What

B.That

C.As

D.Which

答案及解析： A

考查主语从句,what连接主语从句，在主语从句中what做do的宾语，句意是：我的大部分朋友假期想做的事情是参观世博园。选A。