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题型：单选题题类：真题难易度：普通

—Mike, what were your parents doing at 8:00 last night? —My mother was reading________ my father was playing computer games.　

A、while B、when C、unless D、as long as

举一反三

Tomorrow we'll go to the city park ____________ it is sunny.

– Can you play table tennis?

– No, I can't. ________ I can play football.

We have to stay at home ________ the heavy rain.

I'm sure my parents would like to live here.

A recent survey shows that 44 percent of Americans want to use self-driving cars, _________ 34 percent believe that they will make the roads more dangerous.

______ my grandma is 81, she is strong enough to grow and sell vegetables.

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