Whitney Houston’s sudden death suggests that drug abuse is such a serious problem we should deal with properly.
A. as
B. that
C. which
D. where
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(答案→)A. as
B. that
C. which
D. where
解析：惠特尼·休斯顿的突然去世，表明药物的滥用是如此的严重，以至于我们应该妥善的
处理好这个问题。such….as固定句型，as引导定语从句，故选A