. We finished the run in less than half the time _________．

　　A．a(chǎn)llowing　 　　　　　B．to allow

　　C．a(chǎn)llowed　　　　　　　D．a(chǎn)llows

C.


解析:

allowed為過(guò)去分詞，在句中做定語(yǔ)修飾the time�，F(xiàn)在分詞做定語(yǔ)表示正在進(jìn)行的或經(jīng)常性、習(xí)慣性的動(dòng)作；過(guò)去分詞做定語(yǔ)表示被動(dòng)的完成的動(dòng)作。

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