He waited_____the volcano became quiet and he was able to return two days later.

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问题 He waited_____the volcano became quiet and he was able to return two days later.

选项 A、when
B、before
C、as
D、until

答案D

解析 until引导的时间状语从句。句意为“他一直等到火山平息下来,两天后他才得以重回火山上"。
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