单项选择题


A．while
B．since
C．when
D．because
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单项选择题
A．omittedB．isolatedC．enclosedD．occupied
A．omitted
B．isolated
C．enclosed
D．occupied
单项选择题
A．relativeB．intelligentlyC．regularlyD．environmentally
A．relative
B．intelligently
C．regularly
D．environmentally
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