问一道状语从句题____ they become dirty,the lakes are not able to cle

问一道状语从句题
____ they become dirty,the lakes are not able to clean themselves
A.Once B.since C.As D Because

04204085 1年前已收到3个回答举报

富贵大叔幼苗

共回答了16个问题采纳率：93.8% 举报

once的意思是“一旦”,这句话的意思是,一旦他们弄脏了,这湖不能清干净.

1年前

sj00170 幼苗

共回答了24个问题举报

once意为一旦，since表示既然，as表示尽管，becase意为因为

1年前

一夜汀船火独明幼苗

共回答了153个问题举报

根据意思选择
once-一旦
since-自从（常用在完成时）
as-当……时
because-因为
所以选A合适

1年前

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