题目内容

China’s population is expected to increase to about 1.5 billion, ____ it will start to decline slowly.
A．after thatB．since whenC．on whichD．after which
D

试题分析：句意：中国人口预计将增加到大约15亿,之后它将开始缓慢下降。句子中间逗号隔开，逗号钱前是一个主句，逗号后没有连词应是一个从句。that 引导定语从句时不与介词连用，after 是介词，故A.排除。since 引导的状语从句，主句应用现在完成时，故B项排除。根据句意15亿以后，人口开始下降。故选D。
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