By the middle of the 21st century, the vast majority of the world’s population _____ in cities rather than in the country.
A.a(chǎn)re living B.will be living C.have livedD.will have lived
B

試題分析:考查時態(tài)。根據(jù)本句的時間狀語by the middle of the 21st century說明是一個將來時。陳述的是在將來的這段時間里所發(fā)生的事情,所以使用將來進(jìn)行時。句意:到21世紀(jì)中葉,大部分的人口都將生活在城里而不是在鄉(xiāng)下。故B正確。
點評:時態(tài)題的考查關(guān)鍵是抓住句中的時間狀語。要根據(jù)時間狀語來選擇合適的時態(tài),在平時的學(xué)習(xí)中要注意積累有關(guān)時態(tài)的用法和各種時態(tài)的特殊之處。
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