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John was so sleepy that he could hardly keep his eyes . [ ] A. open B. to be ope

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John was so sleepy that he could hardly keep his eyes . [ ] A. open B. to be ope

John was so sleepy that he could hardly keep his eyes __________.

[    ]

A. open   B. to be open   C. to open   D. opening

试题答案

答案:A