The river, ____ are covered with trees, is very long.
| A．which banks | B．of which banks |
| C．whose the banks | D．the banks of which |
______ met, it won’t be easily forgotten.
| A．If you | B．when it | C．once | D．Once you were |
-----They used to be good friends, but now they are like strangers. ----- How _____ this ______?
| A．were; come about | B．did; come about |
| C．were; taken place | D．were; happened |
We have spent _____ money on English books.
| A．a great deal of | B．a good many |
| C．a plenty of | D．a number of |
People in America speak the same language ______ the British do.
| A．which | B．what | C．as | D．like |
Who has found out the answer _____ this question?
| A．of | B．for | C．to | D．about |