2. 外语
  3. Living in the desert involves a lot of problems, _______ water shortage is the worst.

Living in the desert involves a lot of problems, _______ water shortage is the worst.

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问题 Living in the desert involves a lot of problems, _______ water shortage is the worst.
选项 A、not to mention
B、of which
C、let alone
D、for what
答案B
解析 考查带介词的定语从句。of which引导非限制性定语从句，which指代problems。若把先行词和定语从句还原为：Living in the desert involves a lot of problems，water shortage is the worst(of it)。更容易确定答案为B。
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