问题
Many scientists believe that the universe began with an enormous explosion called the “Big Bang”, ______ happened about 13.7 billion years ago.
A:that
B:which
C:when
D:what
B:which
C:when
D:what
正确答案是：
同类题型
I would like a job which pays more, but ______ I enjoy the work I’m doing at the moment.[ ]
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t suppose Jim could have done so well inyesterday’s exam , ____________
-Did you get ro the village before the sun set -No It was already midnight My bike____ on the way