107指考英文考科-16

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<題組題>[題組:第16題到第20題]Many people at some point in life have white spots on their fingernails. One of the most common causes for these little white spots is a condition called leukonychia. Although the name sounds pretty serious, the condition typically ______.
(A) isn’t
(B) doesn’t
(C) couldn’t
(D) wouldn’t