单项选择题
Adults sometimes envy children who play all the time ______ they themselves have to work, rain or shine.
A．while
B．once
C．since
D．though
点击查看答案&解析
<上一题
目录
下一题>
热门
试题
单项选择题
While I was waiting for her, I killed time ______ looking in the show windows.
A．by
B．with
C．in
D．over
点击查看答案&解析
单项选择题
They ______ shopping, when someone knocked at the door.
A．are about to
B．are to go
C．were about to go
D．were to go
点击查看答案&解析
相关试题
35（）
34（）
33（）
32（）
31（）