On account of fuel supplies being finite and many people being wasteful we will have to i

问题补充：

On account of fuel supplies being finite and many people being wasteful, we will have to install solar heating device in our home.

A. some type of a

B. some types of a

C. some type of

D. some types of

答案：

A. some type of a

B. some types of a

(答案→)C. some type of

D. some types of

解析：考查some和冠词的用法：句意：因为燃油是有限的，而且很多人很浪费，我们将不得不在家里安装某种太阳能供暖设备。这里some是某个，后面接单数名词，some type of+名词不需要冠词，选C。