About 80% of all marine waste is plastic from bottles and packaging.This rubbish runs into rivers _________ it rains and then flows into the sea.（　　）

A．since

B．when

C．unless

D．until

【答案】B

【解答】

【點(diǎn)評(píng)】

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發(fā)布：2024/5/27 14:0:0組卷：52引用：3難度：0.5

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1．________ I went to Jiuzhaigou，I was shocked by its beauty.I'd say it was the most beautiful place I saw ________.（ ?。?/h2>