问题
选择题
It’s ten years since the scientist _______ on his life’s work of discovering the valuable chemical.
A．made for
B．set out
C．took off
D．turned up
答案
答案：B
此题考查短语动词的辨析。make for some place “走向”；set out on sth. “开始做”；take off “脱下，(飞机)起飞”；turn up “出现、显现”。