It is desirable that the automation equipment_running as much of the time as possible.

题目

It is desirable that the automation equipment_running as much of the time as possible.
A.would be kept B.must be kept C.will be kept D.should be kept

答案

D正确. 解释：这是一种虚拟语气.语法规则如下：It is/was desirable (important, essential, necessary, advisable, imperative, obligatory, preferable, natural, vital, 等形容词) 后面是that 从句时,从句中的谓...