21. ___________ its logical design, ease of using, and low cost, it is surprising that this product has not dominated the
market.
(A)To give
(B)Given
(C) Giving
(D) By giving
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統計: A(19), B(64), C(15), D(21), E(0) #1676268
統計: A(19), B(64), C(15), D(21), E(0) #1676268