问题
选择题
One in five humans ___ access to safe drinking water by 2080．
A．is said lacking
B．is said to lack
C．are said to lack
D．are said lacking
答案
答案：B
考查主谓一致。humans指多个民族，谓语动词用单数，be said to do据说……，根据句意选B。
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