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外语
It’s uncertain______the experiment is worth doing.
It’s uncertain______the experiment is worth doing.
admin
2010-02-22
52
问题
It’s uncertain______the experiment is worth doing.
选项
A、if
B、that
C、whether
D、how
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/B19K777K
0
专业英语四级
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