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

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

出自：南阳师范学院-教育学-大学英语（四）

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