问题
选择题
Wait a moment, please. When I _________ writing the letter, I will go shopping with you.
A．will have finished
B．have finished
C．will finish
D．finished
答案
答案：B
题目分析：句意：请等会，当我写完这封信的时候，我会和你去购物。这里主句是一般将来时，从句不能用一般将来时，可以用一般现在时或现在完成时，所以选B。