单项选择题

By the year 2010, scientists probably ______ a cure for cancer.

A．will be discovering
B．are discovering
C．will have discovered
D．have discovered
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单项选择题
Jim isn't ______, but he did' badly in the final exams last semester.
A．gloomy
B．dull
C．awkward
D．tedious
单项选择题
In the past men generally preferred that their wives ______ in the home.
A．worked
B．would work
C．work
D．were working
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