单项选择题

I’ve worked ______ four hours on this article, I’m completely ______.

A. in, concentrated
B. at, distorted
C. out, captured
D. for, distracted
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单项选择题
In the U.S., a President can be elected to office only ______.
A. once
B. twice
C. three times
D. four times
单项选择题
What is the main purpose of the research
A. To make preparations for a new publication.
B. To learn how couples spend their weekends.
C. To investigate what people do at the weekends.
D. To collect materials for ads.
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