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题型:单选题
题类:常考题
难易度:普通
过去完成进行时练习
He ______ research in the US for many years, but when he came back, he became a businessman.
A、
had been doing
B、
has been doing
C、
did
D、
has done
举一反三
McDonald's announced the Beijing-based corporate group __________ the franchise(特许经营) bid to run its China operations for the next 20 years on Monday.
The bus we {#blank#}1{#/blank#}(一直等待) was too crowded, so we decided to catch a later one.
They ______ the road by the end of last month.
He came back late because he _____ for her for two hours.
He _____ English for three years before he went abroad.
—Why did they go to the bed early that night?
—They were tired. They _____ the walls all day.
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