CelebratingValentine’sDaycameinto

问题详情：

 Celebrating Valentine’s Day came into __________ fashion many years ago in China, and flower shops can sell dozens of roses __________.

A. a; at a time         B. /; at a time                  C. /; at one time        D. the; at times

【回答】

B

知识点：词组 短语

题型：选择题