2. 专升本
  3. Solid-fuel engines are simpler than liquid-fuel engines, ______have important uses.

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
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