单项选择题
______ unemployment is high, crime is high too; it can be assumed that the latter is due to the former.
A．Before
B．Where
C．Unless
D．Until
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单项选择题
I tried to phone her office, but I could not ______.
A．get along
B．get on
C．get to
D．get through
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单项选择题
—It looks heavy. Can I give you a hand —______.
A．No, thanks
B．Yes, my pleasure
C．No, never mind
D．Yes, I do
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