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有没有语法高手可指点一下,万分感谢.
1, The most important chemical catalyst on this plane is chlorophyll, ---------carbon dioxide and water react to form carbohydrates. A whose presence B which is present C which is present D in the presence of which Why D is the right key?
2, __________at the site of a fort established by the Northwest Mounted Police. Calgary is now one of Canada’s fastest growing cities.
A- Built, B-it is built C- To build D- Having built The key is A, but what's wrong with C ?
4, (When used) as food (additives), antioxidants prevent fats and oils from (become) rancid when exposed to air, (and thus) extend their shelf life. What’s wrong with C?
5, The western world is (beset) with range of (problem) that characterize (mature), postindustrial (societies). Is problem need plus s?
6, Acrylic (paints) are (either) applied (using) a knife or diluted and (spreading) with a paintbrush.
Is C/using right? What’s wrong with D?
Thanks.
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