问题描述：
选哪个,请给出原因.A.to realize B.realized C.have realized D.realizing
European countries,________crisis is at hand ,are providing great encouragement for parents to create more babies in the 21^st century
European countries,________crisis is at hand ,are providing great encouragement for parents to create more babies in the 21^st century
问题解答：
我来补答展开全文阅读