Once ______, the information superhighway will drastically change the lifestyle of all the residents on this island.

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问题 Once ______, the information superhighway will drastically change the lifestyle of all the residents on this island.

选项 A、it being completed
B、it completed
C、completed
D、it completes

答案C

解析连词的用法。once在这里是连词，意为“一旦…就…”，后面省略了it is。

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专业英语四级

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