问题补充：
Leaders of the BRIC countries-----Brazil, Russia, India and China----their second summit on Friday. President Hu Jintao then returned home to help direct relief work the deadly earthquake in Qinhai.
A. left, to follow
B. concluded, following
C. had left, following
D. had concluded, followed
答案：
A. left, to follow
(答案→)B. concluded, following
C. had left, following
D. had concluded, followed
解析：可联系答.案.网客服索取。
