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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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may 和likely重复，排除AB
D where错误
C 错误 because of 不可以放在be 动词后面，必须与normal verb连用 唯一的例外是强调句型。It is because of X that Y verb
"because of" can't follow a form of "to be". it has to follow a normal verb.
today's delay is because of the rain --> incorrect
the train was delayed because of the rain --> ok
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