单项选择题

A research worker might ______ that the existence of such kind of disease is due to the pollution of the are

A． referB. inferC. conferD. prefer
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单项选择题
Weather ______, our family can go to the grassland in Inner Mongolia and stay with herdsmen for a few days.
A．to permit
B．permits
C．permitting
D．permitted
单项选择题
Sarah ______ articles to the New York Times from time to time.
A．distributes
B．issues
C．subscribes
D．contributes
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