______the room temperature, she kept the heater on.

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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 考查动词不定式。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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