Parents should pay attention to the cases their children have difficulty adapting to new surroundings.
A. where
B. as
C. why
D. when
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(答案→)A. where
B. as
C. why
D. when
解析：考查定语从句：句意：父母应该注意这样的情况，孩子们对适应新的环境有困难。先行词是the cases，定语从句中缺少地点状语，用where引导定语从句，选A。