单项选择题


A．appears
B．occurs
C．exists
D．succeeds
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单项选择题
A．howeverB．thereforeC．furthermoreD．moreover
A．however
B．therefore
C．furthermore
D．moreover
单项选择题
A．conveyB．imposeC．implyD．involve
A．convey
B．impose
C．imply
D．involve
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