请选择DCBA;J)w(R He is a letter his friend.3H-M/L;_,i*W9o.a
A. write，to3H-M/L;_,i*W9o.a
B. writing, to3H-M/L;_,i*W9o.a
C. write, for3H-M/L;_,i*W9o.a
D. writing, for3H-M/L;_,i*W9o.a