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In the past , ice used to used to the air in a room. A.be ;cool B.be ;cooling C.

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In the past , ice used to used to the air in a room. A.be ;cool B.be ;cooling C.

In the past , ice used to       used to       the air in a room.

A.be ;cool                      B.be ;cooling           C.being; cool          D.being ;cooling

试题答案

A