The little boy came riding full speed down the motorway on his bicycle, ________ it was!

A.What a dangerous scene

B.What dangerous a scene

C.How a dangerous scene

D.How dangerous the scene

答案及解析： A

解析：

句意：这个小男孩骑着自行车全速地在高速公路上飞驰，多危险的一幕啊！感叹句是常用句式，结构为：What a/an+adj.+n.+主语+谓语！或How+adj.+a/an+n.+主语+谓语！根据句子结构，答案选A。此句也可说成：How dangerous a scene it was!