中文谷Youmustbecarefulwhenyouswim
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问题详情：
You must be careful when you swim ______ the river.
A. by B. over C. through D. across
【回答】
D
知识点：介词和介词短语
题型：选择题
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问题详情：
You must be careful when you swim ______ the river.
A. by B. over C. through D. across
【回答】
D
知识点：介词和介词短语
题型：选择题
