专升本英语单项选择题每日一练(2019.09.27)

单项选择题
The guide dogs helping the people with dementia will （）.
A．respond to the owners" order
B．respond to a sound device
C．act on the owners" instructions
D．act on the trainers" order
单项选择题
What about having a drink?（）
A.Good idea
B.Help yourself
C.Go ahead, please
D.Me, too
单项选择题
I have spent a lot of time（）working on this problem.
A.at
B.–（不填）
C.on
D.with
单项选择题
He carried on（）after his accident.
A.to work
B.work
C.working
D.worked
单项选择题
As far as the professor （）, college students should get into the habit of studying by themselves.
A．concern
B．concerns
C．concerned
D．is concerned