______at the outset, ______instead of shifting things about may be pheromones released when they reach committee size.

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问题 ______at the outset, ______instead of shifting things about may be pheromones released when they reach committee size.

选项 A、The stimuli set them off. .. build collectively
B、The stimuli that set them off. . . building collectively
C、The stimuli setting them off. . . they build collectively
D、Being set off by stimuli. .. their building collectively

答案B

解析 stimuli是本题的主语,定语从句that set them off at the outset跟在其后,第二空格处应为分词短语building collectively作状语。由此可知本题答案为B。
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