这句英语是什么句型?each drug was being used for what it was designed forwas后面咋又用的being,这是咋回事?直接was used不就行了?

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这句英语是什么句型?eachdrugwasbeingusedforwhatitwasdesignedforwas后面咋又用的being,这是咋回事?直接wasused不就行了?这句英语是什么句型?ea

这句英语是什么句型?each drug was being used for what it was designed forwas后面咋又用的being,这是咋回事?直接was used不就行了?
这句英语是什么句型?
each drug was being used for what it was designed forwas后面咋又用的being,这是咋回事?直接was used不就行了?

这句英语是什么句型?each drug was being used for what it was designed forwas后面咋又用的being,这是咋回事?直接was used不就行了?
过去进行时的被动~

be used for.....这个短语

我觉得应该是过去进行时

这是过去进行时的被动语态 was/were+being+done

被动语态啊

用being 是因为这是过去进行时态的被动语态(was/were +being +done) 药品正在被用。