问题
选择题
In the past, ice used to ______ used to ______ the air in a room.
A．be ;cooling
B．be; cool
C．being; cool
D．being; cooling
答案
答案：B
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In the past, ice used to ______ used to ______ the air in a room.
A．be ;cooling
B．be; cool
C．being; cool
D．being; cooling
答案：B