问题补充:
Some of the engines were not suitable for the work they were for.
A. intended
B. to intend
C. intending
D. being intended
答案:
(答案→)A. intended
B. to intend
C. intending
D. being intended
解析:考查语态。句意:一些引擎不适合他们意向的工作。结合句意可知the work是intendfor的动作对象,故用被动语态,选A。