His parents were teachers in that school, _______ lost their lives in order to save their students in the earthquake.
| A．none of them | B．both of them | C．none of whom | D．both of whom |
My colleague has been recovering gradually since the operation, and it wont’ be long ______ he comes back to work．
| A．before | B．since | C．after | D．when |
Don’t you know ______, my dear friend, it is you that she loves?
| A．who | B．which | C．that | D．what |
She was so angry and spoke so fast that none of us understood ______ he said meant．
| A．that | B．what | C．that that | D．what what |
What will people die of in 100 years? If you think that is a simple question, you ______ attention to the revolution taking place in biotechnology．
| A．have not been paying | B．had not been paying |
| C．were not paying | D．will not be paying |
The girl wearing a pair of dark glasses comes from a city in South China, ______ is evident from her accent．
| A．who | B．that | C．where | D．as |