The famous scientist was going out he found himself surrounded by lots of young people.A

发布时间：2020-08-16 12:52:59

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

网友回答

(答案→)A. when
B. before
C. while
D. after
解析：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。
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