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外语
We must______ that the experiment is controlled as rigidly as possible.
We must______ that the experiment is controlled as rigidly as possible.
admin
2014-07-20
50
问题
We must______ that the experiment is controlled as rigidly as possible.
选项
A、secure
B、ensure
C、assure
D、issue
答案
B
解析
此题考查动词词义。ensure 确保。issue为无关干扰词,发行:分配。
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0
专业英语四级
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