问题描述：
we want to have a bright future we must learn to act in ways（）do not~
If we want to have a bright future,we must learn to act in ways （ ）do not harm other living things
a.in which
b.that
c./
d.how
If we want to have a bright future,we must learn to act in ways （ ）do not harm other living things
a.in which
b.that
c./
d.how
问题解答：
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