______ food is hard to find, few birds r...

______ food is hard to find, few birds remain throughout the year.

A. Where B. Although C. Unless D. When

A 【解析】试题分析：考查从句。从句food is hard to find不缺少成份，所以只能在关系副词里选择，Where 表示地点，When表示时间，句意：那里的食物很难找到，一年到头很少的鸟停留。所以选B。考点：考查从句。

考点分析：

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