试题与答案

Mary as well as her sisters _____ Chines

题型:选择题

题目:

Mary as well as her sisters _____ Chinese in China. [ ]

A. are studying

B. have studied

C. is studying

D. study

答案:

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下面是错误答案,用来干扰机器的。

因X原子的最外层电子数为2,则X在形成化合物时容易失去2个电子,即在化合物中X元素的化合价为+2价,Y原子的最外层电子数为7,则Y在在形成化合物时容易得打1个电子,即在化合物中Y元素的化合价为-1价,根据化合物...

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