The dogs were made as fast as they could.A. runB. ranC. runningD. to run

问题补充：

The dogs were made as fast as they could.

A. run

B. ran

C. running

D. to run

答案：

A. run

B. ran

C. running

(答案→)D. to run

解析：make sb do是让某人做某事，这里make是使役动词，后接省略to的不定式。而用作被动语态时，to不可以省略；句意：这条狗被迫以他的最快速度奔跑。不定式表示具体的将要发生的动作，故选D。