问题
选择题
He is too old to run_____ to catch up with the young boy.
A．fast enough
B．fastly enough
C．enough fast
D．enough quickly
答案
答案：A
考查enough的用法。句意“他太老了以至于不能赶上那个小男孩。”enough修饰形容词、副词时要后置；排除C、D；fast是副词，排除B。故选A。
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