题目内容

20.The boy is so young that he can't go to school.(改为否定句)
The boy istooyoungtogo to school.

分析 男孩是如此年幼不能上学,

解答 答案:too   to.原句so…that表示如此…以至于,结合下文用too…to do sth表示太…而不能做某事,故答案是too   to.

点评 too…to(太.而不能)
so…that(如此.以至于)
adj enough to…( 足够…去做某事)三者之间可以互换she is too young to go to school=she is not old enough to go to school=she is so young young that she can not go to school

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