45. "Narrow down" in line 3 is closest in meaning to ___________.
(A) limit in range or scope
(C)liberate in length
(B) deregulate in width
(D)find
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統計: A(16), B(0), C(0), D(1), E(0) #2994392
統計: A(16), B(0), C(0), D(1), E(0) #2994392