2. 外语
  3. We must______that the experiment is controlled as rigidly as possible.

We must______that the experiment is controlled as rigidly as possible.

admin2017-04-12  38
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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