______ food is hard to find, few birds remain throughout the year.A．WhereB．Altho_刷题宝

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

A．Where

B．Although

C．Unless

D．When

上一题下一题 0.64难度单项选择更新时间:2015-01-28 09:12:39

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