问题补充：
his arrival, he began to make preparations for the speech of the conference.
A. In
B. With
C. On
D. By
答案：
A. In
B. With
(答案→)C. On
D. By
解析：他一到达就开始为会议演讲做准备
一...就的表达法：介词on/upon
连词 as soon as/ the moment/ directly/ immediately
以及hardly...when/ no sooner...than
句子还可写成Upon his arrival, he began to make preparations for the speech of the conference.
As soon as he arrived , he began to make preparations for the speech of the conference
