________ an egg safe and warm, the male penguin keeps it on its feet for 60 days until the baby peng...
2022-09-26 04:35:13 148次 北京市海淀区2017-2018学年第二学期期中高一英语试卷（有答案） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
________ an egg safe and warm, the male penguin keeps it on its feet for 60 days until the baby penguin hatches out.
A. Keep B. Kept
C. Keeping D. To keep
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