Monique had to exercise great care at this______ stage of the experiment.

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问题 Monique had to exercise great care at this______ stage of the experiment.

选项 A、scientific
B、potential
C、valid
D、crucial

答案D

解析形容词辨析 scientific “科学的”；potential“潜在的，可能的”；valid“有效的，有根据的，正当的”； crucial“至关紧要的”，它意同critical。

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大学英语四级

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