题目内容
In the past,ice ______food.
| A．used to keep |
| B．used to be used for keeping |
| C．was used to keeping |
| D．used to be used to keeping |
B
考查情态动词的被动语态。句中used to be used for keeping中的used to是情态动词，意思是“过去常常”，而be used for 是动词use 的被动形式；这个句子还可以表达成：was used to keep 或used to be used to keep。
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