there is a snowstorm or some other bad weal. her, the mail always comes on ti_刷题宝

题干

there is a snowstorm or some other bad weal. her, the mail always comes on time.

A．Because

B．If

C．When

D．Unless

上一题下一题 0.64难度单项选择更新时间:2010-10-13 11:14:48

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