单项选择题


A．users
B．takers
C．carriers
D．receivers
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单项选择题
A．becauseB．whenC．whichD．that
A．because
B．when
C．which
D．that
单项选择题
A．henceB．actuallyC．howeverD．indeed
A．hence
B．actually
C．however
D．indeed
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