He ran and ran, but he couldn’t run ________to catch the bus.

A. so fast B. enough fast C. too fast D. fast enough

D 【解析】句意：他跑了又跑，但他跑得不夠快，沒趕上公共汽車。enough作副詞，意為“足夠地；充足地”，用于形容詞和副詞之后。故選D。
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