题目内容

It’s said that this kind of plant only gives off this strange perfume on ________ conditions which the scientists are trying to figure out now.
A．outstandingB．certainC．obvious D．ordinary
B

试题分析：A. outstanding杰出的，B. certain当然的，C. obvious 显而易见的，D. ordinary普通的，句意：据说这种植物只在一定的条件下散发出奇怪的香味，科学家现在正在想方法弄明白。所以选B。
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