If (it was) not for the opening policy,the situation in China would never have been what it is today.
从句意来考虑,今天这样(What it is today)应该是一个完成的状态,所以是完成时.
另,虚拟语气中,条件从句的动词动作可以和主句的动词动作时态不一致.又如：If they had studied hard,they could do it easily now.
帮忙看个虚拟语气的句子书上的例句：if not for the opening policy, the situatio
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