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题目内容
（南阳师范学院-教育学-大学英语（四））
Living in the desert involves a lot of problems, ____water shortage is the worst.
(A) not to mention
(B) of which
(C) let alone
(D) for what
(A) not to mention
(B) of which
(C) let alone
(D) for what
参考答案