单项选择题

By the year 2010, scientists probably ______ an effective treatment for cancer.

A．will have discovered
B．are discovering
C．will be discovering
D．have discovered
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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
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
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