If we ___________some measures, we might have prevented the environmental pollution.
| A．take | B．had taken | C．took | D．have taken |
相关试题
Many old Chinese people have the concept of ________ some money for their future use.
| A．picking up | B．setting aside | C．putting off | D．setting up |
The chief________of the year 2010 for Shanghai will be the Expo.
| A．incident | B．event | C．affair | D．accident |
Are the two glasses believed________by Tom?
| A．broken | B．to be broken | C．to break | D．to have been broken |
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