He_____ more than 5,000 English words when he entered the university at the age of 15.( )
A.has learned
B.would have learned
C.learned
D.had learned
正确答案是D
He_____ more than 5,000 English words when he entered the university at the age of 15.( )
A.has learned
B.would have learned
C.learned
D.had learned
正确答案是D