made us very pleased was the China Pavillion(中国国家馆) attracted a lot of visitors.
A. What; that
B. What; whether
C. That; that
D. Which; that
网友回答
(答案→)A. What; that
B. What; whether
C. That; that
D. Which; that
解析：主语从句缺少主语，故用what；was后是表语从句，表语从句不缺成分，故用that引导。“使我们很高兴的是，中国国家馆吸引了很多游客。”故选A。