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
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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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单项选择题
The man denied ______ any thing at the supermarket when he was questioned by the police.
A．to have stolen
B．to steal
C．having stolen
D．having been stealing
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