单项选择题

By 2010, scientists______ a cure for the common cold.

A．will discover
B．will have discovered
C．have discovered
D．will be discovering
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单项选择题
It was because he was too inexperienced ______she didn't know how to deal with the situation.
A．so
B．as
C．that
D．then
单项选择题
He was the only one of the villagers who______ killed in the earthquake last week.
A．was
B．were
C．has been
D．have been
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