21. Paul is a man_______I believe has the best understanding of what it is that makes our products different from others on the market.
(A) who
(B) whom
(C) whose
(D) how
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統計: A(39), B(30), C(7), D(2), E(0) #2717400
統計: A(39), B(30), C(7), D(2), E(0) #2717400