问题
Scientists study ____ human brains work to make computers [ ]
A: when
B: how
C: that
D: whether
B: how
C: that
D: whether
正确答案是：
同类题型
Lily went to see the movie alone. —If she _____ me about it, I would have gone with her.
The education system rather than the teachers__________for the overburden on the students
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