怎样填?It is suggested that the question---------(decide) at once.用所给动词的正确形式填空.

should be decided
虚拟语态，外加被动式
或则be decided.

should be decided
用虚拟语气,should可省略

that the question---------(decide) at once
宾语从句 这里the question 是主语
如填decide 的主动语态,则没有宾语与之对应
所以用被动语态 be decided
再看,suggest 可用 should be decided 或 be decided

should be decided
虚拟语态，外加被动式

deceided!

(should) be decided
第一个不对，虽然should可以省略，但动词不能。这是表示建议的虚拟

suggest +that从句时,从句中要用虚拟语气should do形式,本句又是被动句,用should be done形式,所以填should be decided,should可以省略

be decided.
suggest做"建议"讲,后接从句句式应为:
suggest that sb.(should) do sth.
其中do为动词原型,should可以省略.
此句中question为物,后应该用被动,即be decided.

be decided
因为suggest要用虚拟语气,应添should be decided,should可省略