Neglecting to clean the filter of the air conditioner regularly will cause the unit to work less______.

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问题 Neglecting to clean the filter of the air conditioner regularly will cause the unit to work less______.

选项 A、effective
B、effectiveness
C、effectively
D、effect

答案C

解析空格处需要填入一个副词与比较级less搭配使用来修饰不定式to work，所以(C)effectively(有效地)是正确答案。此题中形容词(A)，名词(B)和(D)均不能修饰动词。

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