问题
Who ________ a theory about black holes
A:Havingsearched
B:put down
C:put away
D:put off
B:put down
C:put away
D:put off
正确答案是：
同类题型
If only you __________ him what I said! Everything would have been all right.
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Why not listen to BBC news to improve your listening skillsIt’s difficult for me follow.