句型转换7\8^4X+}9j0q'R,z'F5h5_
I sent a letter to you last month. （改为被动语态）7\8^4X+}9j0q'R,z'F5h5_
A letter 6x1p1C4T9M([;T)E8T5Z2p*_to you last month.7\8^4X+}9j0q'R,z'F5h5_