He was___ at what he found.选择题
A assured
B astonished
C contented
D convinced
答：B.
译：他对所发现的事大为吃惊.
分析：此题主要考动词和介词的固定搭配.
be assured of sth.
be astonished at sth.
be contented with sth.
be convinced of sth.