单项选择题
A．ItB．WhatC．Just asD．As______ is well known, light, lik……
______ is well known, light, like heat, is a form of energy.
A．It
B．What
C．Just as
D．As
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单项选择题
Scarcely ______ such an exciting movie.
A．have I ever seen
B．I have ever seen
C．saw I
D．I saw
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单项选择题
There ______ some mistakes in your composition.
A．have
B．has
C．seems to be
D．seem to be
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