单项选择题

John and Sue（）computer games for hours before their parents came home from work.

A. are playing
B. have been playing
C. played
D. had been playing

<上一题 目录 下一题>
热门 试题

单项选择题
Our ancestors celebrated（）birth of（）child by giving away red eggs.

A. /; a
B. /; the
C. the; a
D. the; the
单项选择题
The speed at which an animal lives is determined by（）the rate at which it uses oxygen.

A. measuring
B. assessing
C. surveying
D. pleasing
相关试题