(之前我们做过can have done用法小结,can have done表推测时都是对过去进行推测,但是may have done不仅可以推测过去) may/might have done 推测现在 “may/might+动词的完成式”表示对...
Promote the construction of main power grid structure and intelligent upgrading and rebuilding of urban and rural power grids and carry out the construction of demonstration projects such as smart grid and micro-grid. 【资料来源:省委深改办(自贸办)...
should have done ought to have done shouldn't have done ought not to have done needn't have done could have done (二)三级试题汇编 1、I'm feeling sick. I ___ so much chocolate. A. needn't have eaten B. couldn't have eaten C. mustn't have eaten D. sh...
But even with more traffic and fewer sidewalks, modern parents do have one advantage their parents didn’t: the cell phone. Being able to check in with a child anytime goes a long way toward relieving parental anxiety and may help parents loosen th...
答案B. 表可能性只能用may.此句意可从后半句推出。 比较have to和must 1) 两词都是"必须"的意思,have to表示客观的需要,must 表示说话人主观上的看法,既主观上的必要。 My brother was very ill, so I had to call the doctor in the middle of the night.我弟弟病得...
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