2. 外语
  3. All astronauts Acarry a passport Bduring they are traveling in space Cbecause they may need it upon Dreturning to Earth.

All astronauts Acarry a passport Bduring they are traveling in space Cbecause they may need it upon Dreturning to Earth.

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问题 All astronauts Acarry a passport Bduring they are traveling in space Cbecause they may need it upon Dreturning to Earth.
选项 A、 
B、 
C、 
D、 
答案B
解析 During is a preposition where an adverb is needed to introduce a subordinate clause. Correction: while.
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