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

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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
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

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
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,从句中的谓语动词常用 should + 动词原形.其中should 可以省略.这类形容词通常表示“建议”或“有必要”.

表示建议、命令、要求等这一类的动词后面从句中，或者相应的主语从句，要用虚拟语气。
desire that sb (should) do sth. or It's desirable that sb (should)do sth.

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