单项选择题

-- I bought this computer for $500 last week.
-- It's on sale this week for only $4,00. You should have waited.
-- Oh, Really But how______I know

A．can
B．will
C．do
D．would
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单项选择题
Catholicism is an integral and______influence on Irish national life and culture.
A．persistent
B．persuasive
C．pervasive
D．perceptive
单项选择题
You won't get there on time______you set off right now by air.
A．unless
B．even
C．in case
D．other than
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