6. The bank tries its best to attract more customers. Its staff members are always available to provide __________ service.
(A) singular
(B) prompt
(C) expensive
(D) probable
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統計: A(21), B(78), C(8), D(16), E(0) #490870
統計: A(21), B(78), C(8), D(16), E(0) #490870