搜题
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第1题

6.-Why does the stream smell terrible? Because large quantities of water_____ A. have polluted B. is being polluted
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第2题

5.-Jake, you didn.t come to the party lastnight?, I____ but I suddenly remembered I hadassignment to do A. had to. B.
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第3题

4.The bookshelf over there is____ A. Mary.s and Jane.s B.Mary.s and Jane C. Mary and Jane.s D.Mary and Jane
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第4题

3.E-mail, as well as mobile phone,____an important part in daily communication. A. is playing B. have played. C. are
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