We must ______ that the experiment is controlled as rigidly as possible.A、secure

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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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