Traffic police have to make decisions__________．

A．on the spot

B．on business

C．on purpose

D．on the watch

查看答案及解析进入在线模考

参考答案

【参考译文】交通警察必须在现场做决定。
【答案解析】本题考查on相关的词组辨析。on the spot，在现场；on business，出差；0n purpose，故意地；Oil the watch，密切注意。从本题句意来看，应该是说交通警察必须当场做决定，所以选A。

1 Do you think Tommy is __________ the truth?

A．saying

B．speaking

C．telling

D．talking

查看解析在线模考

2 He got a job so that he could be independent __________ his parents．

A．on

B．in

C．of

D．from

查看解析在线模考

3 Would you mind __________ the computer game in your room?

A．him playing

B．his playing

C．him to play

D．him play

查看解析在线模考