Scientists have many theories about how the universe ___ into being.
A．cameB．was coming
C．had comeD．would come
A
考查時態(tài)的用法。宇宙是如何形成的，因?yàn)橛钪娴男纬蛇@個動作已經(jīng)發(fā)生，所以用一般過去時來表示已經(jīng)發(fā)生的動作。
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