单项选择题

No sooner had the words (been spoken) (so) he (realized) that he (should have remained) silent.

A．been spoken
B．so
C．realized
D．should have remained
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单项选择题
(The) veterinarian has (examined) several dogs, two of (those) are (believed) to be developing rabies.
A．The
B．examined
C．those
D．believed
单项选择题
Whatever you say, I don't believe he would be ______ refuse to help me.
A．selfish enough
B．enough selfish to
C．as selfish as to
D．so selfish as to
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