早教吧 育儿知识 作业答案 考试题库 百科 知识分享

thebook,hefoundoutsomeanswerstothisquestion.A.AshereadingB.AthisreadingC.AsreadingD.OnreadingD为什么?为什么不选C

题目详情
____ the book,he found out some answers to this question.
A.As he reading B.At his reading C.As reading D.On reading
D 为什么?为什么不选C
▼优质解答
答案和解析
若要选C.此时as用作连词,连接一个时间状语从句,意为“当~时候”:即
As he was reading the book,he found out some answers to this question.故C不对.
on/upon为介词,此处意为“一~就”,后接名词或动词的ing形式.
On/upon reading reading the book,he found out some answers to this question.
由于后跟的reading,所以只能选D.