问题
Robert saw two boys making fun ________ an old man, and then he stopped them.
A:in
B:on
C:at
D:of;
B:on
C:at
D:of;
正确答案是：
同类题型
tried phoning her office，but I couldn’t ________.
The old man lives _________, but he doesn’t feel ________.
I am a determined person____ I have made up my mind, nothing can change my mind
No one couldtheirtears while watching the moving performances.
Because of the 2014 APEC, students in Beijing had days thanstudents in other cities last week.