Question

His father began to work____he was seventeen years old. A as old as B as early as B since D while

选什么？ 为什么？

Answer 1

你好。while (==when )是正确的选择。
A as old as 的后面不能加句子
B as early as的后面不能加句子
B since 的主句必须是现在完成时
D while (== when) 作为连接词，后面的句子谓语动词可以是be动词.又如：
-------- He came unexpectedly to see me WHILE I was busy that day.

又是周末了，祝你愉快

Answer 2

选择C since 是自从的意思，从。。。时候开始
自从17岁开始就开始工作了

希望能采纳，谢谢

Answer 3

since与过去时间连用，
AB两个选项应该左右结构对等，所以不符，
while一般与进行时连用
句意：他爸爸17岁开始就工作了

P.S.:中考知识点，本题考查连词辨析

Answer 4

since自从

Answer 5

选B