We can no longer to consider water an almost free resource that we can use as much as we

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A. permit
(答案→)B. afford
C. expect
D. offer
解析：考查动词在语境中的意义及用法。permit doing sth.允许做某事；expect to do sth.期望做某事；offer to do sth.主动提出做某事；afford to do sth.承受得起做某事。句意：我们再也承受不起把水看作免费的资源，想用多少就用多少了。选A。