单项选择题

Because of Einstein's Theory of Relativity, scientists no longer regarded the world______.

A．as they did before
B．as they before did
C．as did they before
D．as before did they
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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
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
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