---Do you know this coastal city at all?
| ---Do you know this coastal city at all? ---No, this is the first time I _____here. |
| [ ] |
| A. was B. have been C. came D. coming |
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将CI2通入NaBr和NaI的混合液.CI先与谁反应.说清楚点
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你能帮帮他们吗