2. 专升本
  3. It was not until the invention of liquid-fuel rocket______ the launching of artificial satellite became possible.

It was not until the invention of liquid-fuel rocket______ the launching of artificial satellite became possible.

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问题 It was not until the invention of liquid-fuel rocket______ the launching of artificial satellite became possible.
选项 A、which
B、when
C、where
D、that
答案D
解析
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