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

試題分析：句意：中國人口預(yù)計(jì)將增加到大約15億,之后它將開始緩慢下降。句子中間逗號(hào)隔開，逗號(hào)錢前是一個(gè)主句，逗號(hào)后沒有連詞應(yīng)是一個(gè)從句。that 引導(dǎo)定語從句時(shí)不與介詞連用，after 是介詞，故A.排除。since 引導(dǎo)的狀語從句，主句應(yīng)用現(xiàn)在完成時(shí)，故B項(xiàng)排除。根據(jù)句意15億以后，人口開始下降。故選D。
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