【单选题】The main purpose of the research is ______
A.to make preparations for a new publication
B.to learn how couples spend their weekends
C.to know how housework is shared
D.to investigate what people do at the weekend
【单选题】The main purpose of the research is ______
A.to make preparations for a new publication
B.to learn how couples spend their weekends
C.to know how housework is shared
D.to investigate what people do at the weekend
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