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air traffic is closely controlled, flying is relatively safe. [ ] A．UnlessB．As s

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air traffic is closely controlled, flying is relatively safe. [ ] A．UnlessB．As s

________ air traffic is closely controlled, flying is relatively safe.

[]

A．UnlessB．As soon asC．AlthoughD．Once

试题答案

答案：D

提示：

once意为“一旦”，引导时间状语从句。

标签：controlledflyingrelativelycloselyair

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