2. 专升本
  3. We must___________that the experiment is controlled as rigidly as possible.

We must___________that the experiment is controlled as rigidly as possible.

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问题 We must___________that the experiment is controlled as rigidly as possible.
选项 A、assure
B、achieve
C、ensure
D、issue
答案C
解析 assure(n.)使确信，向……保证，后面常接人作宾语；achieve(n.)取得，达到，完成；ensure(n.)保证，确保，后面可以接从句作宾语；issue(u.)发行，发布。根据句意可知，选C。
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