单项选择题

Johan's score on the test is the highest in the group; he ______ last night.

A．should have studied
B．must have studied
C．has studied
D．should study
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单项选择题
By the year 2010, scientist probably ______ a cure for cancer.
A．will be discovering
B．are discovering
C．will have discovered
D．have discovered
单项选择题
The farmer used wood to build a house ______ to store grain.
A．with
B．in which
C．which
D．where
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