单项选择 适中0.65 引用1 组卷223
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 |
23-24高二上·上海·期末
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We were going out for a Christmas meal together ____ the accident happened.
| A．unless | B．until | C．while | D．when |
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