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 The great changes _______ have taken place _______ carrying out the economic reform in our country.
A.may not; unlessB.could not; without
C.never; but forD.would; besides
B

试题分析:考查虚拟语气。题中without相当于if引导的条件虚拟语气,与过去事实相反,故主句用could have done。句意:要不是在我们国家实施经济改革,不可能发生巨大的变化。故B正确。
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