Living in the central American desert has its problems, ______obtaining water is not the least.

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问题 Living in the central American desert has its problems, ______obtaining water is not the least.

选项 A、of which
B、for what
C、as
D、whose

答案A

解析 of which“其中"。句意:住在美洲中部沙漠有很多问题,其中获得水源并不是最小的问题。
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