题干
The days ____we spent together on the farm are not easy ______．
A：when,toforget
B：which, to be forgotte
C：that, to forget
D：/,to be forgotte
答案(点此获取答案解析）
C
A：when,toforget
B：which, to be forgotte
C：that, to forget
D：/,to be forgotte
