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).

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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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