After graduating from college, I took some time off to go travelling, _____ turned out to be a wise decision.
| A．that |
| B．which |
| C．when |
| D．where |
The girl was listened _______in the next room when I came back last night.
| A．to singing |
| B．to sing |
| C．singing |
| D．sang |
They've made the mistake again, though they _______.
| A．intended to |
| B．didn't intend to |
| C．intended |
| D．didn't intend |
---Bob has gone to California.
---Oh, can you tell me when he _________?（2011北京卷32）
| A．has left |
| B．left |
| C．is leaving |
| D．would leaving |
When Alice came to, she did not know how long she _____ there. （2011新课标卷29）
| A．had been lying |
| B．has been lying |
| C．was lying |
| D．has lain |
He made a wonderful discovery,of great importance to science.
A which I think is
B. which I think it is
C. which I think it
D. I think which is