--- Advertisements sometimes help people...

--- Advertisements sometimes help people learn more about new products.

--- But sometimes ads ________tell lies.

A. had better B. should C. must D. may

D 【解析】试题分析：句意：-广告有时帮助人们更多了解关于新产品。-但是有时广告可能会撒谎。A. had better最好； B. should 应该； C. must必须； D. may也许。根据句意故选D。考点：考查情态动词的用法。

考点分析：

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