A.At the beginning of the 3rd semester.B.At the end of the 3rd semester.C.At the beginning of the 2nd semester.D.At the beginning of the 1st semester.
A.At the beginning of the 3rd semester.
B.At the end of the 3rd semester.
C.At the beginning of the 2nd semester.
D.At the beginning of the 1st semester.