2. 外语
  3. Before they are actually sent up in a spacecraft，______(宇航员需经受各种各样的测试)．

Before they are actually sent up in a spacecraft，______(宇航员需经受各种各样的测试)．

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问题 Before they are actually sent up in a spacecraft，______(宇航员需经受各种各样的测试)．
选项
答案astronauts are subjected to all kinds of tests
解析 考查固定搭配be subjected to。subject意为“使经受，使遭受”，是被动形式，to后跟名词。
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大学英语六级

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