作业帮__on time,this medicine will be quite effective.1.taking2.being taken3.taken4.having taken选什么为什么?
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__on time,this medicine will be quite effective.1.taking2.being taken3.taken4.having taken选什么为什么?
__on time,this medicine will be quite effective.
1.taking
2.being taken
3.taken
4.having taken选什么为什么?
__on time,this medicine will be quite effective.1.taking2.being taken3.taken4.having taken选什么为什么?
3
逻辑主语是this medicine ,表被动,用过去分词做条件状语
这里是英语习惯用法，属于省略，可以把句子还原就是：If this medicine is taken on time, it will be quite effective.
选3 相当于 if it is taken on time意思是如果按时服用的话，这药会非常有效的
3, 这个句子的整个的主语是medicine(药)是物，是被（人）服用的，所以得用被动式的分词形式，其它几个都是主动态的不行。
medic
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