单项选择题


A．measure
B．step
C．operation
D．arrangement
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单项选择题
A．appearsB．occursC．existsD．succeeds
A．appears
B．occurs
C．exists
D．succeeds
单项选择题
A．howeverB．thereforeC．furthermoreD．moreover
A．however
B．therefore
C．furthermore
D．moreover
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