问题
选择题
He waited ________ the volcano became quiet and he was able to return two days later.
A．when
B．before
C．as
D．until
答案
答案：D
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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He waited ________ the volcano became quiet and he was able to return two days later.
A．when
B．before
C．as
D．until
答案：D
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”。