问题
选择题
(2013·福建高考)________basic firstaid techniques will help you respond quickly to emergencies.
A．Known
B．Having known
C．Knowing
D．Being known
答案
答案：C
选C 考查非谓语动词。句意：了解基本的急救技巧能够帮助你快速应对紧急情况。分析句子结构可知，空处在句中充当主语，应用动词ing形式。having known强调“完成”，不符合句意，可排除。故选C。