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

试题答案

B
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In the past, ice             food, but now we have refrigerators.
[     ]

A. used to keep
B. used to be used for keeping
C. was used to keeping
D. used to be used to keeping

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