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  3. ______ the room temperature, she kept the heater on.

______ the room temperature, she kept the heater on.

admin2012-01-31  77
问题 ______ the room temperature, she kept the heater on.
选项 A、Kept on
B、Keeping up
C、So as to keep up
D、To keep up
答案D
解析 keep up意为“保持状态”，此处为动词不定式作目的状语。
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