单项选择题

You should have put the yogurt into the fridge, I expect it ______ undrinkable by now.

A．became
B．had become
C．has become
D．becomes
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单项选择题
He is a man of integrity. He would ______ kill himself as betray his country.
A．as soon
B．like to
C．rather
D．never
单项选择题
Our teacher recommended that we ______ as attentive as possible when we visit the chapel.
A．are
B．shall be
C．be
D．were
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