We finished the run in less than half the time .
A.allowing B.to allow C.allowed D.allows
We finished the run in less than half the time .
A.allowing B.to allow C.allowed D.allows
C
句意为我们用了不到被允许的时间的一半就跑完了。time后缺少定语,“时间”与“允许”之间是被动关系,因此用过去分词形式。