单项选择题

There being no cause for alarm, you ______ in such a panic yesterday.

A．need not act
B．did not need to act
C．need not have acted
D．did not need to have acted
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单项选择题
He deserves ______ for what be has done in face of crisis.
A．to praise
B．praising
C．being praised
D．having praised
单项选择题
I bought this computer for $500 last week. It's on sale this week for only $400. You should have waited. Oh, really But how ______ I know
A．can
B．will
C．do
D．would
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