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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