He is not to do his homework. which makes his parent worriedA. careful enough B. enough c

问题补充：

He is not to do his homework., which makes his parent worried

A. careful enough

B. enough careful

C. carefully enough

D. enough carefully

答案：

(答案→)A. careful enough

B. enough careful

C. carefully enough

D. enough carefully

解析：carefully副词，细心地；careful形容词，细心的，enough修饰其它词语时，一般放在被修饰词的后面。联系前文系动词is，可知本句是形容词作表语，故选A。