in our city we can take the (subway) to work soon surbway可以是复数吗为什么

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• in our city we can take the (subway) to work soon surbway可以是复数吗为什么
• in our city we can take the (subway) to work soon 为什么subway有了the就要用单数 可以用复数吗我们能乘坐这些地铁去工作也对啊
• in our city we can take the (subway) to work soon 为什么subway有了the就要用单数
• in our city we can take the (subway) to work soon surbway可以是复数吗为什么
• in our city we can take the (subway) to work soon 为什么subway有了the就要用单数 可以用复数吗
• in our city we can take the (subway) to work soon 为什么subway有了the就要用单数
• 狗跑5步的时间，马能跑6步，马跑4步的距离，狗要跑7步，现在狗已跑出55步，马开始追它，问狗再跑多远马可以追到它？
• 观察下列等式1x2分之1=1-2分之1,2x3分之1=3分之1-4分之1将上面三个等式分别相加得：