Slight but _____ variation in the timing of the star’s pulses l

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Slight but _____ variation in the timing of the star’s pulses led astronomers to deduce that it was being pulled backwards and forwards by three planets orbiting around it.

A、subtle
B、regular
C、undetectable
D、inconsequential
E、explicable

答案：B

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出了排除法可以选出B 还有别的方法吗？如何找取反对应？

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