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)