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
