問題詳情

16. What do astronauts do to keep themselves _____ around when _____ sleeping?
(A) not to float; X
(B) from floating; X
(C) from floating; they were
(D) not float; they are

參考答案

答案:B
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)

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