问题
Some of my friends are interested in science, but none of them can tell ____________.
A:when UFOs appear next time
B:if horses know the way or not
C:where was this kind of plant found
D:how elephants communicate
B:if horses know the way or not
C:where was this kind of plant found
D:how elephants communicate
正确答案是：
同类题型
Good luck _____ the coming exam. —Thank you.[ ]
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