All astronauts Acarry a passport Bduring they are traveling in space Cbecause th

游客2025-02-04 1

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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