-What do you think made Grace so happy?-( ) to visit Peking UniversityA Being invitedB Invited为什么选第一个?

问题描述:

-What do you think made Grace so happy?
-( ) to visit Peking University
A Being invited
B Invited
为什么选第一个?

意思是:你认为______令Grace如此高兴?
A.被邀请
B.邀请
明显Grace是被邀请嘛

do you think 是插入语可以略去.
what .made grace happy==缺主语啊.
动名词做主语撒.