The famous scientist was going out _____ he found himself surrounded by lots of young people.
A．whenB．beforeC．whileD．a(chǎn)fter
A
考查固定搭配，was/were doing….when….，剛要做什么，這時，句意：著名的科學(xué)家剛要出去，這時他發(fā)現(xiàn)自己被一群年輕人圍住了，選A。
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