Helen ________ her keys in the office so she had to wait until her husband ______ home.
| A．has left; comes | B．left; had come | C．had left; came | D．had left; would come |
To get well, .
| A．we are going to operate on the patient |
| B．an operation is necessary |
| C．the patient needs an operation |
| D．the doctor will perform an operation on the patient |
The city is known for two famous revolutions.
| A．witness | B．witnessing | C．being witnessed | D．having been witnessing |
It seemed that the sea lion didn’t mind with the tourists at all.
| A．photograph | B．photographing | C．to photograph | D．being photographed |
Jim was a fast swimmer and soon swam the others.
| A．ahead | B．ahead of | C．front | D．in front |
Being admitted to a good university is the to a good job in the future.
| A．way | B．method | C．entry | D．means |