.
His sister left home in 1998, and ______ since.
| A．had not been heard of | B．has not been heard of |
| C．had not heard of | D．has not heard of |
—When did Bob leave?
—I have no idea. I ________ a shower upstairs.
| A．took | B．have taken |
| C．was taking | D．would take |
She is a hardworking student, and all her spare time she has ________ staying in the library.
| A．spent | B．is spent |
| C．to spend | D．to be spent |
—Do you know the Water Cube at all?
—No, this is the first time I ________ here.
| A．have been | B．came |
| C．was | D．am going |
A kind of newlymade shoes, if put into the market, ________ large orders because the heels can switch from 9 to 4 centimeters.
| A．meets | B．will meet |
| C．has met | D．met |
I had meant to meet you at the airport this morning but I was too busy for I ________ a report.
| A．wrote | B．was writing |
| C．have written | D．had written |