问题
选择题
We don't know what _____ in 100 years _____ the humans. [ ]
A. happened, for
B. will happen, to
C. is happened, to
D. will be happened, for
答案
答案：B
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We don't know what _____ in 100 years _____ the humans. [ ]
A. happened, for
B. will happen, to
C. is happened, to
D. will be happened, for
答案：B