1.the poor man ____ graves since he was twenty.

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1.the poor man ____ graves since he was twenty.
a.had dug b.has been digging c.dug d.is digging
2.let's begin our dicussion,__?
a.don't we b,shall we c.will you d.don't you
3.dry ice is ___ cold that,if you touch it with your bare fingers,it __ you.
a.very...burns b.such.will burn c.so.will burns d.so.burns

1.选B,
根据题目的since可以得出是现在完成时态.再看四选项,只有B符合答案.
句意为,这个穷人从他20岁起就在挖坟墓了(现在还在挖),用了现在完成进行时态表过去到现在的持续进行的动作.
2.选B
句意为,我们开始讨论吧.a,c,d是不符合题意的,B选项的shall we意为“好吗?”
3.选C
根据句意：干冰很冷,如果你用手指触摸的话,会把你烧伤.根据后面的“会烧伤”,可得出B,C两选项,再看前面的such,和so,such通常修饰名词,而so才是修饰形容词,并与that 组成so ...that...如此...以致于...
够清楚了啦...

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