【題目】Scientists have many theories about how the universe________into being.
A.came
B.was coming
C.had come
D.would come

【答案】A
【解析】句意為：關于宇宙是如何產(chǎn)生的，科學家們有很多理論。根據(jù)句意可知宇宙產(chǎn)生絕非將來要發(fā)生的事，所以先排除B、D兩項，C項had come為過去的過去，因題中無過去時間作參照，故排除。宇宙產(chǎn)生發(fā)生在過去，故用一般過去時。

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