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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
考查情態(tài)動詞的被動語態(tài)。句中used to be used for keeping中的used to是情態(tài)動詞，意思是“過去常�！�，而be used for 是動詞use 的被動形式；這個句子還可以表達成：was used to keep 或used to be used to keep。
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