单项选择题

Water pollution, together with old tins and other forms of garbage,（）many problems in our large, industrial city today.

A. is causing
B. have caused
C. have been causing
D. are caused

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What did the grandfather use to have（）
单项选择题
Why does the woman want to wait for 5:35 bus（）

A. Because it’ s cheaper.
B. Because it’ s safer.
C. Because it’s faster.
D. Because it’s earlier.
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