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We must______that the experiment is controlled as rigidly as possible.
We must______that the experiment is controlled as rigidly as possible.
admin
2017-04-12
35
问题
We must______that the experiment is controlled as rigidly as possible.
选项
A、assure
B、secure
C、ensure
D、issue
答案
C
解析
ensure vt.保证,担保。
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