We must that the experiment is controlled as rigidly as possible. A．propose B．se
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We must __________ that the experiment iscontrolled as rigidly as possible.
| A．propose | B．secure | C．ensure | D．Issue |
试题答案
【答案】
C
【解析】考查单词，propose 提议,secure 安全的ensure确保,issue发行,我们必须确保实验尽可能严格的进行.