4. You will want two trees about ten feet apart, from ________to suspend your tent.
　　A there
　　B then
　　C which
　　D where
　　5. 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
　　6. 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：
　　4. 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。
　　5. 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。
　　6. 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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