It is reported that two schools,_______ are being built in my hometown,will open next year. A.they both B.which both C.both of them D.both of which 答案:D 解析: both of which引导非限制性定语从句,which指代先行词schools,作of的宾语。they both和both of them都不能引导定语从句,所以是错误的。which both中的which不能修饰both,所以也是错误的。下列所述性质中能证明化合物微粒间一定存在离子键的是( )
(A)易溶于水
(B)具有较高的熔点
(C)熔融状态下能导电
(D)溶于水能电离出离子