【題目】Parents must let their children ______ about the danger of swimming in the river.

A. know B. knew C. knows D. to know

【答案】A

【解析】句意：父母必須讓他們的孩子了解在河里游泳的危險。let sb do sth讓某人做某事，故此處用動詞原形know。故選A。

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