Have you ever seen any trees ________ leaves were black because of the polluted air?
| A．whose | B．that |
| C．which | D．who |
相关试题
— Who is in the reading room? The lights are all on.
— ___________.
| A．Nothing | B．None | C．No one | D．No |
The conference has been held to discuss the effects of tourism _______ the wildlife in the area.
| A．in | B．on. | C．at | D．with |
He went out without an umbrella , __________ in the rain. 
| A．risked being caught | B．risking being caught |
| C．risked to be caught | D．risking to be caught. |
I wish I ___________ the star last night.
| A．saw | B．were to see | C．had seen | D．did see |
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