单项选择题


A．about
B．on
C．as to
D．to
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单项选择题
A．SinceB．AlthoughC．HoweverD．Before
A．Since
B．Although
C．However
D．Before
单项选择题
Which is not sent by the US military
A．Amy
B．Ships.
C．Planes.
D．Personnel.
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