（天津卷12）. I rained heavily in the south, _______ serious flooding in several provinces.
| A．caused | B．having caused | C．causing | D．to cause |
We first met on a train in 2000．We both felt immediately that we _____ each other for years.
| A．knew | B．have known | C．had known | D．know |
—I had been working till 4∶00 a．m. to prepare a report for my boss.
—________you look very tired.
| A．No doubt | B．No hurry | C．No wonder | D．No need |
John didn’t choose of the ties and went away without looking at a third one.
| A．many | B．either | C．all | D．any |
The little boy was so careless with his spelling that she often_____ letters from words.
| A．left out | B．left behind | C．left off | D．let alone |
—You see, I’m poor in maths, you are not good at English, and...
— That’s ____ we should help each other.
| A．when | B．where | C．how | D．what |