题干
It's time ________lunch. Let's stop working.
A：to
B：for
C：of
D：to having
答案(点此获取答案解析）
B
It's time ________lunch. Let's stop working.
A：to
B：for
C：of
D：to having
的解集是M, 方程
的解集是N, 3∈M且3∈N,那么
等于 ( )