2. 考研
  3. We must ______ that the experiment is gong to be controlled as rigidly as possible.

We must ______ that the experiment is gong to be controlled as rigidly as possible.

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问题 We must ______ that the experiment is gong to be controlled as rigidly as possible.
选项 A、assure
B、secure
C、ensure
D、endure
答案C
解析 assure意为“使确信，使放心”，通常构成“assure sb. +that从句”或“assure sb. of”结构；secure意为“保证，保险”，通常不接从句；ensure意为“保证，确保”，通常接从句；endure意为“忍耐，忍受”，通常不接从句。根据空格后面的that从句可知，应该选用ensure。
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