notallinventionswere的精选

问题详情：单项选择。—Inmyopinion，notallinventionswereinventedby________accident.—Well，youdoseemtohave________ntingneedsmuchtimeandhardwork.A．an；a B．an；the C．/；a D．/；the【回答】C知识点：冠词题型：选择题...