While building a bridge over the Changjiang River， ．
A．a big rock was discovered in the water
B．there was a big rock discovered
C．a big rock discovered in the water
D．the workers discovered a big rock in the water
I didn't know who for the broken window．
A．to be blamed B．to blame C．is to blame D．is to be blamed
I can't to London，because the lines are always busy．
A．get out B．get through C．go through D．get along
Though they are not sure of the long-term ，all the scientists agree to start the research immediately．
A．affect B．result C．effect D．effort
We gave them a lot of help in the of money．
A．type B．kind C．form D．way
many times，he still doesn't know how to do it．
A．Being told B．He has been told
C．Having told D．Having been told
