The committee has already deliberated this plan.
committee 为集合名词, 其后面的动词既可为单数也可用复数(主要看它是指一个集体还是指许多个人而定), 例如: The committee meets at four today. 委员会今天四点开会。 The committee get together with difficulty. 委员们开会很难召集齐。
deliberate 尤指作出重大决定前)慎重考虑,仔细思考
The committee has thought the plan over/through.
council has considered this plan carefully.
译文:
委员会已经仔细考虑了这个计划。
The committee have thought carefully over this plan.
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The committee have taken this plan into account seriously.