Once out of the earth’s gravity,the astronaut is _____ by the problem of weightlessness.A.effected B.intended C.injured D.affected

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• once out of the earth's gravity,the astronaut is ____by the problem of weightlessness.填什么?
• once out of the earth's gravity,the astronaut is ____by the problem of weightlessness.
• Once out of the earth’s gravity,the astronaut is _____ by the problem of weightlessness.
• Once out of the earth’s gravity,the astronaut is _____ by the problem of weightlessness.A.effected B.intended C.injured D.affected
• once out of the earth's gravity,the astronaut is ____by the problem of weightlessness.once out of the earth's gravity,the astronaut is ___by the problem of weightlessness.A. affected B. effeccted为什么选A不选B请详解,谢谢.
• once out of the earth's gravity,the astronaut is ____by the problem of weightlessness.填什么?
• 有很多办法保持健康.There are many ways to_____ ______.
• a solar day is the length of time____the Earth to revolve once around the Sun.A it takes B which takes1 此句话中不可以用which吗?2 选择A是不是中间省略了that?不然不是有2个谓语吗is 和 takes?3 the length of time如何翻译?