问题补充:
My grandpa is in his seventies. He’s to take the bus for free.
A. old enough
B. enough old
C. young enough
D. enough young
答案:
(答案→)A. old enough
B. enough old
C. young enough
D. enough young
解析:enough修饰形容词,位于该词之后,又根据第一句内容,可知这位女士是足够大,而可以免费了,故选答案为A