问题补充：
It is the“single certificate”, a talking card for Singles Day, falls on November 11,
became a hot online bestseller this year.
A. which; that
B. that; which
C. which; which
D. that; that
答案：
(答案→)A. which; that
B. that; which
C. which; which
D. that; that
解析：可联系答.案.网客服索取。
