矛盾运动

－Hi Mary, Nice to meet you.

－_____. [ ]

A. Hello, Jenny. Nice to meet you.

B. I'm fine.

C. Good morning.

D. How are you?

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

联盟走向分裂的原因是什么？

复式记账试算平衡的方法？

吊索具与载重物不符会导致什么后果？