1. you will want two trees about ten feet apart, from ________to suspend your tent.

　　a there b then c which 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

　　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

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