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.

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问题 We must ______ that the experiment is controlled as rigidly as possible.
选项 A、secure
B、ensure
C、assure
D、issue
答案B
解析 此题考查动词词义。B项ensure意为“确保；保证”，常相对于某一种结果而言，符合题意。与其意义相近的C项assure意为“向……保证；使……放心”，其后需要接某人，用法为assure sb．that/ of sth.。A项secure意为“确保安全(避免不测)”。D项issue为无关联干扰词，意为“发行；分配”。
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