Half the world’s population ______ water shortages within 15 years according to the World Bank, just one of many recent alarming reports on the world’s fresh water supply.
A．a(chǎn)re sufferingB．have been sufferedC．will sufferD．were suffered
C

試題分析：根據(jù)時(shí)間狀語(yǔ)within 15 years，故用一般將來時(shí)。
點(diǎn)評(píng)：通過時(shí)間狀語(yǔ)，上下句意思和具體語(yǔ)境來確定時(shí)態(tài)。
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