问题

Never before______ so highly successful inhis attempts to forecast the weather accurately on a small scale

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

正确答案是：

同类题型

d man had three sons, all of____ died during World War Ⅱ.

I have reached a point in my life I am supposed to make decisions of my own.

He’salready ridden the horse before ,______?

untry’s population ______ small, andmost of its population ______ in the mountainous areas

ing to my grandparents, it is a goodidea to eat chicken soup when you have a cold. __, scientists agree with them.