Bicycles have been around in our life for more than hundreds of years, but no one knows who ________ the first bicycle.
A.invented
B.had invented
C.has invented
D.would invent
网友回答
A解析句意:自行车出现在我们的生活中有好几百年了,但是没人知道是谁发明了第一辆自行车。根据句意可知设空处应该用过去时,因此排除C项,B项过去完成式表示“过去的过去”,D项表示“过去将来”,均不符合本题要求。