20.______ that caused him to serve dinner an hour later than usual.

A．It was we being late

B．It was our being late

C．It was we were too late

D．It was because we were late

儿童在游戏中反映的现实生活中事物或现象的范围规定是指（）

A.游戏的内容

B.游戏的过程

C.游戏的目的

D.游戏的评价