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問題詳情:

China'spopulationisexpectedtoincreasetoabout1.5billioni...

China's population is expected to increase to about 1.5 billion in 2040, ________it will start to decline slowly.

A. where            B. after which         C. on which            D. which

【回答】

B

知識點:定語從句

題型:選擇題