The famous scientist was going out _____ he fou

The famous scientist was going out _____ he found himself surrounded by lots of young people.
A．when B．before C．while D．after
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A

考查固定搭配，was/were doing….when….，刚要做什么，这时，句意：著名的科学家刚要出去，这时他发现自己被一群年轻人围住了，选A。

1年前

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