问题
选择题
_____ there are living creatures in the outer space as those on Earth hasn't been proved until now. [ ]
A. How
B. When
C. Where
D. Whether
答案
答案：D
搜题请搜索小程序“爱下问搜题”
_____ there are living creatures in the outer space as those on Earth hasn't been proved until now. [ ]
A. How
B. When
C. Where
D. Whether
答案：D
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