The old couple’s son really with the other students in the new class, as they expected.
A. went on
B. called in
C. settled in
D. fitted in
网友回答
A. went on
B. called in
C. settled in
(答案→)D. fitted in
解析：fit in with sb意思为“与某人相融合；与某人相处得好”，相当于get on/along well with sb。