问题
选择题
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
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
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