2. 专升本
  3. It is of vital importance that a person ______ at least both physically and mentally strong to be an astronaut(宇航员).

It is of vital importance that a person ______ at least both physically and mentally strong to be an astronaut(宇航员).

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问题 It is of vital importance that a person ______ at least both physically and mentally strong to be an astronaut(宇航员).
选项 A、shall be
B、be
C、are to be
D、must be
答案B
解析 语法结构题。it is of vital importance＝it is very important，本题考查主语从句中的虚拟语气，谓语动词用should+动词原形，should可省略。句意：要成为一个宇航员，身心健康是非常重要的。
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