题干
. Dr. Smith, together with his wife, ______ visit Beijing this summer.
A：is going to
B：are going to
C：was going to
D：were going to
答案(点此获取答案解析）
A
A：is going to
B：are going to
C：was going to
D：were going to
=1×10—14mol·L－1，满足此条件的溶液中一定可以大量共存的离子组是 （ ）
