People often have this belief development is bad for the environment, but this does not have to be true.
A. that
B. which
C. where
D. how
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(答案→)A. that
B. which
C. where
D. how
解析：考查同位语从句，本句中的this belief后面的同位语从句that development is bad for the environment是解释名词belief的内容。That引导同位语从句，在句中不充当任何成分，只起引导作用，故A正确。