is expected that it will be fine tomorrow, when we can do some outdoor activitie
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_______ is expected that it will be fine tomorrow, when we can do some outdoor activities．
A．As B．It C．That D．Which
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解析：选B。句意：预计明天天气很不错，我们可以进行一些户外活动。分析句子结构可知that引导一个主语从句，故用it 作形式主语。