The girl hid herself under the table ______ she could see everything taking place in the room.
| A．after which | B．from where | C．from which | D．in where |
The museum will open in the spring with an exhibition and a viewing platform __________ visitors can watch the big glasshouses being built.
| A．what | B．where |
| C．when | D．why |
The maid is said __________ in the family when she was serving there.
| A．to be treated badly | B．having been treated badly |
| C．being badly treated | D．to have been badly treated |
Air pollution is getting more and more serious, so we must take action __________ it is too late.
| A．before | B．after |
| C．until | D．when |
Private cars really provide much convenience to people, and __________ they cause too many problems.
| A．meanwhile | B．therefore |
| C．otherwise | D．instead |
Zhao Benshan, whose overwork __________ his health failure, is said to have performed in the Spring Festival Gala on CCTV in 2011.
| A．contributed to | B．appealed to |
| C．applied to | D．owed to |