83.--______those students Chinese,do you have to speak their language very often?
问题描述：
83.--______those students Chinese,do you have to speak their language very often?
--No,they learn most when the class is taught in a foreign
language.
A.To teach
B.Taught
C.Having taught
D.As to teach
答
选A To teach 不定式表示目的.“为了.”
D 的as to 表示“谈及”明显不符.C?C是现在分词的完成时作状语。这个术语不用管它。记住用法是通常当后面的主句是过去时，用了Having done 表示动作发生在主句谓语动词之前，并且强调发生的事情对于后面主句发生的是有影响的。给你举个例子，Having driven so fast ,we were fined by the traffic pollice today. (今天，我们车开太快了，后来交警给我们开了罚单。) 开的快在开罚单之前，并且对开罚单有影响。才使用。明白了吗？