Solid-fuel engines are simpler than liquid-fuel engines,______have important uses.

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问题 Solid-fuel engines are simpler than liquid-fuel engines,______have important uses.

选项 A、both of them
B、both
C、both of which
D、both all

答案C

解析 “名词(代词)+of+which(whom)”引导的定语从句常表示部分与整体的关系。在本句中引导非限制性定语从句，指代前面的两个对象，并在从句中作主语。故选C。

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