The poor boy couldn't work the problem out. He wasn't clever.A. thatB. muchC. enoughD. to

问题补充：

The poor boy couldn work the problem out. He wasn clever.

A. that

B. much

C. enough

D. too

答案：

(答案→)A. that

B. much

C. enough

D. too

解析：此处that副词，意为：那样；much 多；enough 足够地；too很，十分。句意：那个可怜的男孩不能解出那个问题。他没那么聪明。此处that clever意为：那么聪明。这里that用作副词，修饰形容词。