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

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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