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题库 / Prep2007E1-SC-136
It seems likely that a number of astronomical phenomena, such as the formation of planetary nebulas, may be caused by the interaction where two stars orbit each other at close range.
may be caused by the interaction where two stars orbit each other
may be caused by the interaction between two stars that each orbit the other
are because of the interaction between two stars that orbit each other
are caused by the interaction of two stars where each is orbiting the other
are caused by the interaction of two stars orbiting each other
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C/D/E，phenomenas are because of the interaction，because of介宾短语，介词是有自己的意思的，比如Shanghai is in China,上海是在中国里面。
不是某物是因为……，是某物发生什么情况是因为……，如：He do it because of money. 为钱而做事，
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