问题: 求助英语问题
1.The doctor advised me to have a walk every day because walking is the best way to______health.
A.maintain B.reserve C .stay D.preserve
2.A technique _______out, the yields increased by 20%.
A.worked B.had been worked C.working D.having worked
3.Tom sold the vegetables at half price rather than______them to go bad.
A. allow B.allowed C.allowing D.be allowed
请问这几个选择题应该怎么选择呀.为什么呢,谢谢给分析分析
解答:
1选D,preserve health是"保持健康"的意思.
2选A,机器已经不能工作了,所以用一般过去时
3选B,因为前面是"sold",过去式,前后要保持一致,所以选B."汤姆把蔬菜以一半的价钱卖掉而不是让它坏掉".
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