Before we install a new heating system we should be sure we cannot make ______us

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问题 Before we install a new heating system we should be sure we cannot make ______use of the one we already have.

选项 A、efficiently
B、efficiency
C、efficient
D、more efficiently

答案 C

解析这句话的意思是说，在安装新的供暖装置之前，我们应该确保对现有设备不能再加以有效使用。空格处缺少形容词做use的定语，故选(C)。(A)efficiently副词，有效地；(B)efficiency名词，效率。

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