問題詳情


(B) Close Test (21~30)Many years ago, people had little knowledge about outer space. After the first human 21. into space, people startedto know more about it and wanted to travel there.The place 22. astronauts work is called a space station. Living on a space station isn’t easy. 23. , getting sleepcan be difficult for some astronauts because of the frequent sunrises and sunsets. 24. asleep, some count sheep, and otherstake medicine. When 25. , they must tie their sleeping bags to the walls to 26. themselves from floating around.People 27. that going into space was a crazy idea. Today, 28. to space is possible even if you aren’t an astronaut.The price is, however, not 29. . If you get a chance to experience the trip in outer space, do remember 30. morephotos!
21.
(A) had been sent
(B) has been sent
(C) has sent
(D) was sent

參考答案

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

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