I prefer to deal with big companies because their service and reputation are better than

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A. that
(答案→)B. those
C. ones
D. one
解析：B　考查替代词。根据句意，空格处被替代的名词应为上文中的service and reputation，并且空格后有定语限制，故用those代指。that特指名词的单数形式；ones泛指名词复数形式；one泛指名词单数形式。