【单选题】【消耗次数：1】
I have spent a lot of time_______repairing the machine.
①
at
②
/
③
on
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A: Have you been wasting time on computer games again? B: Not really. I’ve been studying a lot and I need a break.
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I [填空]talk to everyone a lot,but now we communicate by email most of the time.
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随机题目
【单选题】
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精密度高则没有随机误差
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精密度高则准确度一定高
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