这道题为什么选B?Listening and speaking are both necessary to English; ___practices our oral

Listening and speaking are both necessary to English; ___ practices our oral English and ___ makes us know what other people say.
A. one; the other B. this; that

它用来指已被提到的人或物;也可表对比,指两个中较远的那个。
What about that book you borrowed from me last month?
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