單格填空第 19 題
There may be a threshold below which blood pressure reductions become ______ given that a long-running study showed no decreased heart risk for drops in blood pressure below a certain point.
Blank |
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(A) worthwhile |
(B) indiscernible |
(C) arduous |
(D) significant |
(E) superfluous |
出處:OG, p.513, #4