I ________ for three hours when I suddenly became sick．

[　　]
A．

had been working

B．

would work

C．

have worked

D．

am working

答案：A
解析：

此題考查時(shí)態(tài)的正確使用，句意：我工作了三小時(shí)，這時(shí)候我突然覺(jué)得不舒服。空格處應(yīng)該用過(guò)去進(jìn)行時(shí)、過(guò)去完成時(shí)或過(guò)去完成進(jìn)行時(shí)才能與時(shí)間狀語(yǔ)for three hours連用。


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