In the 1950s in the USA, most families had just one phone at home, and wireless phones _______ yet.
| A． |
haven't invented |
B． |
haven't been invented |
| C． |
hadn't invented |
D． |
hadn't been invented |
Now _______ you have to do is to admit your mistakes and immediately correct them.
| A．that | B．whether |
| C．what | D．how |
Word came, as expected, ______ college entrance English exam will be reformed soon.
| A．it | B．what |
| C．which | D．that |
is known to all is that Beijing and Zhangjiakou have been trying to co-host the 2022 Winter Olympic Games on Nov 3, 2013.
| A．What | B．Which |
| C．It | D．As |
The book has helped me greatly in my daily communication, especially at work ________ a good impression is a must.
| A．which | B．when |
| C．as | D．where |
The man _______ came to see you is my brother.
| A．who | B．whose |
| C．which | D．where |