问题
选择题
Robert is said ______ abroad, but I don’t know which country he studied in.
A．to have studied
B．to study
C．to be studying
D．to have been studying
答案
答案：A
study这一动作发生在主句谓语之前，所以用不定式的完成时；且but I don’t know which country he studied in.说明他已经不在国外学习了，所以选A。