16. I have never heard such a beautiful song _____.
| A．ago | B．before | C．later | D．Just |
I was close to being killed the other day. A car passed me at ____ I thought was a dangerous speed.
| A．as | B．which | C．what | D．that |
After half a year’s training, they were made entirely used ____ underwater.
| A．stay | B．to stay | C．to staying | D．staying |
Thank you very much for the trouble you have taken _________ me with my English.
| A．helping | B．to help | C．help | D．helped |
Before the conference, a new problem came up __________ could speak on behalf of our group.
| A．that | B．who | C．which | D．how |
He dressed up and went to the party as if ___________.
| A．was invited | B．had been invited | C．invited | D．to be invited |