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

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(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。