the zoologists tried to prove was that the photo of the South China Tiger had been staged or technologically dealt with.
| A．That | B．Why | C．Whether | D．What |
The old couple have been married for 40 years and never once ______ with each
Other.
| A．they had quarreled | B．they have quarreled |
| C．have they quarreled | D．had they quarreled |
______ their service, the workers of the hotel are active in learning English.
| A．Improving | B．To improve | C．Improve | D．Having improved |
Is this the museum _____ you visited the other day?
| A．that | B．where | C．in which | D．the one |
To qualify yourself for this kind of new job, I recommend that you ________ some online courses.
| A．to take | B．taking | C．take | D．would take |
It was the first time I _______ there and I was impressed by the friendly people very much.
| A．go | B．was going | C．had gone | D．have gone |