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【参考答案】

Therefore — 改成However，
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单项选择题
A．howB．whenC．whyD．where
A．how
B．when
C．why
D．where
单项选择题
A．its being multinational.B．its simultaneous operation.C．its major role of heroin supplier.D．its major role of cocaine supplier.
A．its being multinational.
B．its simultaneous operation.
C．its major role of heroin supplier.
D．its major role of cocaine supplier.
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