Mr.Li often works very hard.When I ()him at eleven last night,he()in the office

Mr.Li often works very hard.When I ()him at eleven last night,he()in the office

题目
Mr.Li often works very hard.When I ()him at eleven last night,he()in the office
saw worked
was seeing was worki
was seeing worked
saw was working
求说明下啊
答案
选最后一个.第一个空,因为时间状语是last night,所以用一般过去式saw.第二个空表示我看到他的时候,他正在做...所以,用过去进行时.
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