1．I’ll never forget the lesson ______ last year.
A.that I learn B.that I learned
C.what I learn D.what I learned
2．The young lady _____is interviewing Lin Zhixuan about the program I am a singer is from 21st Century Talent Net.
A. who B. whom C. which D. whose
3．—What are you looking for?
—I’m looking for the watch _______ I bought yesterday.
A．which B．who C．whose
