1.___ they become dirty,the lakes are not able to clean them

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1.___ they become dirty,the lakes are not able to clean themselves.a.once b.since c.as d.because
请问为啥选·A

有一次它们脏了,但湖里却洗不了澡.once有一次as和because都是因为的意思,句意连不通；since从…开始,用于完成时,不合语态.帮到你的话望及时选为满意答案,

1.___ they become dirty,the lakes are not able to clean them how dirty the tables are ,they need ---------A to clean B cl The water is not dirty but very ___(cold/clean) the more dirty they are,the more you love them These are dirty desks. Let's clean they.改错 These are dirty desks.Let's clean they(改错） The ___(able) people are unable to walk 单项选择1.If you ___ during the day,you might not able to study 1.Let them ___（clean ）the classroom for us 选择填空：1.It's ＿,They are on duty .They need to clean the libra They ___(not be)able to have lessons for 3 months. They can swim in the warm lakes or they can go b____on them