Sam was to make so many mistakes in the English exam.A. careful enoughB. enough carefulC.

问题补充：

Sam was to make so many mistakes in the English exam.

A. careful enough

B. enough careful

C. careless enough

D. enough careless

答案：

A. careful enough

B. enough careful

(答案→)C. careless enough

D. enough careless

解析：此题重点考查单词enough的基本用法。它有 两个词性，作为形容词可以修饰名词，可放在名词之前，也可放在名词之后；作为副词用来修饰形容词或其他副词必须放在被修饰词之后。根据语境可知be是系动词，其后只能跟形容词，故选C。