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 只有當我們擁有足夠的知識輸入才能在英語的說和寫中表現(xiàn)得精彩．

解答 答案：B．
分析句子結(jié)構(gòu)可知，本句的句式屬于only+when引導的時間狀語從句位于句首，所以后面的主句要使用部分倒裝，可排除C和D；因為從句的時態(tài)為一般現(xiàn)在時，所以主句的時態(tài)也應(yīng)該使用現(xiàn)在時的時態(tài)，可排除A．故選B．

點評 對于倒裝句式要熟練掌握幾種基本的結(jié)構(gòu)，靈活運用部分倒裝和全部倒裝的用法．

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