Question

【题目】________ 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

Answer 1

【答案】D

【解析】考查非谓语动词。句意：为了保持蛋的安全和温暖，雄企鹅把蛋放在脚上60天，直到小企鹅孵出来。分析句子可知，这里用动词不定式表示目的。故选D。