问题
选择题
Knowing how to think clearly and how to speak correctly ________ one confidence.
A．give
B．has given
C．have given
D．gives
答案
答案：D
题目分析：考查主谓一致：句意：知道怎么清楚地思考怎么正确的说话给人自信。Knowing how to think clearly and to speak correctly这一个整体在句子中是充当主语成分的动名词，谓语用单数，排除AC，因为这是客观事实，用一般现在时，选D。