6. A master piano tuner, Franz Mohr was sought after for his ____ knowledge of pianos and great skill developed over decades.
(A) prostrate
(B) intricate
(C) desperate
(D) obstinate
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統計: A(5), B(17), C(1), D(4), E(0) #3436328
統計: A(5), B(17), C(1), D(4), E(0) #3436328