The time I had been looking forward to __at last and I saw my favourite star,
A.comingB.having comeC.cameD.come
选择C
误导点在于 looking forward to doing 然而这里分析成分后发现 looking forward to 仅仅为插入成分.实际上,句子可以简化为The time (I had been looking forward to) _came_at last and I saw my favourite star.