The room is in a terrible mess; it _______ cleaned.
| A．can’t have been | B．shouldn’t have been |
| C．mustn’t have been | D．wouldn’t have been |
Shanghai, China’s biggest and most dynamic city, which in the Yangtze River Delta, is playing a leading role in the country’s economy.
is situating B. situated C. has situated D. is situated
His sister left home in 1998,and__________ since.
| A．wasn’t heard of | B．hadn’t heard of |
| C．hadn’t been head of | D．hasn’t been heard of |
–I won in the match! --- !
Bad for you B. Good for you C. Good news for me D. Bad news for me
After several days of social activities, I decided to _ on my research on the human behaviors.
| A．fix | B．settle | C．set | D．concentrate |
I came to the music hall, I got addicted to the tone.
| A．The first time | B．For the first time | C．First time | D．First |