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英语17.John was so sleepy that he could hardly keep his eyes _

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英语17.John was so sleepy that he could hardly keep his eyes _______.
17.John was so sleepy that he could hardly keep his eyes _______.
a.open b.to be opened c.to open d.opening
为什么
英语17.John was so sleepy that he could hardly keep his eyes _
选第三个.keep后面可以直接加doing便是一直做某件事情.这里面keep sth do的形式表示的是过去某个时候的动作,用doing则表示进行时或者一直怎么样.