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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