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
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
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