The streets are all dry. It _____ during the night.
| A．must have rained | B．should have rained |
| C．can’t have rained | D．couldn’t rain |
Every means ___ the river from being polluted.
| A．are used to prevent | B．are used to preventing | C．is used to prevent | D．is used to preventing |
___ long way it is from Xi’an to Guangzhou!
| A．How | B．So | C．What | D．What a |
It was because it rained last night ___ he didn’t come.
| A．when | B．so | C．that | D．so that |
“Did you scold him for his mistakes? ” “Yes, but ___ it.”
| A．I’d rather not do | B．I’d rather not have done | C．I’d not rather have done | D．I’d better not done |
In the busiest season the peasants were seen ___ their tractors ___from morning till night.
| A．have, work | B．have, working | C．to have, working | D．to have, be worked |