When I _ the letter,he _to visit us?A.wrote;cameB.was writing;C.was writing;cameD.wrote;was coming

问题描述:

When I _ the letter,he _to visit us?A.wrote;cameB.was writing;C.was writing;cameD.wrote;was coming

C.was writing;came
当他拜访我们时,我正在写信