问题

Only when we saw the photos about the air crash ________ how terrible it was[ ]

A: had we known
B: we had known
C: did we know
D: we knew

正确答案是：

同类题型

Ten years ago the population of our village wasthatof theirs.

Can you take a __________ for Jenny, please

I’ll let you know as soon as he _________.

The boy often spend half_____ hour reading the newspaper every morning.

al evidence began to__________, suggesting that thenew drugs had a wider range of useful activities than had been predicted fromexperiments in animals.