【題目】________ 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

【答案】D

【解析】考查非謂語動(dòng)詞。句意：為了保持蛋的安全和溫暖，雄企鵝把蛋放在腳上60天，直到小企鵝孵出來。分析句子可知，這里用動(dòng)詞不定式表示目的。故選D。

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