A clean environment can help the city bid for theOlympics, which ____ will promote its economic development.A．in nature B．in return C．in turn D．in fact C【解析】试题分析：考查介词短语：

111. Morning exercises will ____ good toyour health. You should keep early to bed and early to rise.

He never __________ to help those in trouble because he was a kind－hearted man. [ ]

You can’t imagine how beautiful the plant is you’ve seen it with your own eyes.

Gun control is a subject_______ Americans have arguedfor a long time