请教一下英语题目1.______under a microscope,a fresh snowflake has a d

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/21 11:18:36

请教一下英语题目
1.______under a microscope,a fresh snowflake has a delicate six-pointed shape.为什么空格要填Seen,而不填Seeing呢?
2.In winter,animals have a hard time_____anything to eat.为什么空格要填finding,而不填to find呢?
3.The government is trying to do somgthing to _____better understanding between the two country.为什么空格要填promote,而不填increase呢?他们两有什么区别?
4.Only under special circumstances ________to take make-up tests.为什么空格要填are freshmen permitted,而不填are permitted freshmen呢?
5._______before we depart the day after tomorrow,we should have a wonderful dinner party.为什么空格要填Were they to arrive,而不填Had they arrive呢?这句应该是虚拟语气吧,省略了if,为什么不填前面的?
以上有5题,请给界人士帮帮忙,解释一下,谢谢咯!

1 这句其实是个倒装句并且有省略还原过来是 a fresh snowflake has a delicate six-pointed shape when was seen under a microscope 题干省略了 was 并且把后半部分提到开头,所以给人以混淆,觉得seeing也可以其实seeing是说不通的.
2 先看个例子 I hardly have time to do sth
我几乎没有时间去做（某件事、另外的）
I hardly have time doing sth
我几乎没有时间去做（现在手头的事）
此题明显指动物在冬季寻找食物比较困难寻找食物是动物现在要做的
3 increase指增加后面一般接speed rate 表示速度速率产量之类的词总之跟数字联系比较紧密而promote指促进从字面就可以看出不同促进中美两国之间更深层次的交流和理解电视上经常说的
4 此句仍然是倒装 Only在句子开头修饰壮语要倒装调到主语freshmen之前
5 确实是虚拟语气还有倒装和省略表示对将来的假想
还原下we should have a wonderful dinner party if they were to arrive before we depart the day after tomorrow
句型：条件从句 + 主句
were+ 不定式 + would/should + 动词原形
没有你的说法
可能有错误仅供参考

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