问题

I failed again in the examination and only then_______how much time I had wasted.

A:I realized
B:I had realized
C:did I realize
D:had I realized

正确答案是：

同类题型

Guang Zhou’s traffic facilities have beengreatly improved _____ an advanced new light railway for the Asian Games.

Is your husband at home— I am not sure. __________ he is in the office.

i, who was born in Pula, in_______is now Croatio, made her filmdebut in Italy in the mid-1930s

The boy is only four years old， but he can swim ______ the lake.

When did you last hear ________ Jay?-He phoned me this morning，and we agreed ________ a time and place to meet.[ ]