<p>In a world that the rate of technological and social change accelerates frighteningly, change itself often seems to be the only constant. </p>
<p>The answer says that "that" must be replaced with "in which". Why so?</p>
<p>thanks for answers</p>
<p>in which means where. world is a place, so relative pronouns should be ‘where’ or ‘in which’. ‘that’ refers to things/concepts/experience…</p>