______ the rain yesterday，we _____ such fresh air now．
| A．Were it not for; couldn’t enjoy |
| B．Had it not been for; couldn’t enjoy |
| C．But for; can’t have enjoyed |
| D．Without; couldn’t have enjoyed |
I Peter at once although I hadn’t seen him for 10 years
| A．knew | B．realized | C．recognized | D．remembered |
On Christmas Day, children have _____ singing, dancing and playing games.
| A．funs | B．a fun | C．the fun | D．fun |
The report indicates that the new power station produces energy as the one built earlier.
| A．twice as much | B．as twice | C．twice much as | D．twice much |
So far there is no proof people from other planets do exist.
| A．how | B．what | C．which | D．that |
_____ scores of times , but he still couldn’t understand it ．
| A．Having explained | B．Having been explained |
| C．Though it was explained | D．It was explained |