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6.Only when we have enough"input"_________ excellent"output"-speaking and writing in English.(  )
A.did we presentB.can we presentC.present weD.we can present

分析 只有当我们拥有足够的知识输入才能在英语的说和写中表现得精彩.

解答 答案:B.
分析句子结构可知,本句的句式属于only+when引导的时间状语从句位于句首,所以后面的主句要使用部分倒装,可排除C和D;因为从句的时态为一般现在时,所以主句的时态也应该使用现在时的时态,可排除A.故选B.

点评 对于倒装句式要熟练掌握几种基本的结构,灵活运用部分倒装和全部倒装的用法.

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