问题补充:
— Why not turn to your history teacher for help?
— .
A. I’m too busy
B. I’m sorry
C. That’s a good idea
D. It doesn’t matter
答案:
A. I’m too busy
B. I’m sorry
(答案→)C. That’s a good idea
D. It doesn’t matter
解析:考查交际用语。A我太忙了;B对不起;C这是一个好主意;D没关系;句意:—为什么不向你的历史老师求助?—好主意。根据句意说明C正确。