1.They have found a best way __the price from keeping___.
A.to prevent;rising B.to stop;raising
答案是选C为什么不选D?（主要是两个选项的后半部分有什么区别?）
2.Oil price __ sharply to the news of the crisis in the Middle East.
答案为reacted,这里不是表被动吗?
英语书上有一句The English spoken between about AD450 and 1150 was very different from the English spoken today.
什么情况下be动词可以省去?
3.____ in thought,he almost ran into the car in front of him
A.Losing B.Lost C.to lose
答案是选B为什么不选A?
4.The old lady treats the boys as if he____her own child
A.was B.were
答案是选B,为什么不选A?