Itisagoodtime_____.    A.sing                     B.to...

问题详情：

 It is a good time _____.    

A. sing                      B. to sing                      C. singing              D. sang

【回答】

B  It is a good time to do sth. 是固定句型结构

知识点：动词和动词短语

题型：选择题