1. You will want two trees about ten feet apart, from ________to suspend your tent. A there B then C which来源:www.100test.com D where 2. That was so serious a matter that I had no choice but ______the police. A called in B calling in C call in D to call in 3. Americans eat ________as they actually need every day. A twice as much protein B protein twice as much C twice protein as much D protein as twice much 参考答案: 1. 正确答案:C 例题解析: 介词 关系代词 不定式作定语,只有which 是关系代词。 2. 正确答案:D 例题解析:Have no choice but 后要带接to 的不定式,意思是 只能……别无选择。 3. 正确答案:A 例题解析:译文:美洲人每天所食用的蛋白质是他们实际需要的两倍。倍数 as 形容词 as,表示倍数。