We prefer that the plan ( ) before being put into execution.A.is fully discussed B.must be fully discussedC.be fully discussed D.will be fully discussed

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We prefer that the plan ( ) before being put into execution.A.is fully discussed B.must be fully discussedC.be fully discussed D.will be fully discussed

We prefer that the plan ( ) before being put into execution.A.is fully discussed B.must be fully discussedC.be fully discussed D.will be fully discussed
We prefer that the plan ( ) before being put into execution.
A.is fully discussed B.must be fully discussed
C.be fully discussed D.will be fully discussed

We prefer that the plan ( ) before being put into execution.A.is fully discussed B.must be fully discussedC.be fully discussed D.will be fully discussed
We prefer that the plan should be fully discussed before being put into execution.这是完整的句子 其中should可以省略 因为prefer 所以要用虚拟语气

这里省略了一个would,plan would be fully discussed,这里would可以省略

(should) be fully discussed ,should 可以省略,一般用should,表示虚拟语气

计划被讨论,所以要用be
虚拟句所以discuss用过去时