单项选择题


A．most
B．some
C．many
D．few
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单项选择题
A．whileB．sinceC．whenD．because
A．while
B．since
C．when
D．because
单项选择题
A．omittedB．isolatedC．enclosedD．occupied
A．omitted
B．isolated
C．enclosed
D．occupied
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