China, a country with 145 million elderly people, will ________ an aging society during this century, according to Chinese population experts．
A.suggestB.remainC.replaceD.become在线课程B
考查动词区别。根据题意知应该是“仍然保持在老龄社会”这种状态，故用B项。
由于前面提到已经有145 million elderly people，因此，不应该是become(变成)老龄社会。