China's population is expected to increase to about 1.5 billion in 2040, ______it will start to decline slowly.
A．whereB．whichC．on whichD．a(chǎn)fter which
D

試題分析：考查非限制性定語從句。句中有逗號，說明是非限制性定語從句，先行詞是2040，指時間，排除A；on when相當于when，但on指具體的一天，這里的2040年是一段時間，排除C；which作主語或賓語，it will start to decline slowly不缺少成分，排除B，after which相當于after 2040，故選D。
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