猴子模型图片:By getting down___ all these jobs,we can certainly overcome all the difficulties facing us

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A to do B doing C to doing D do
答案及解析。。
再问一个：to什么时候用作介词。什么时候用成不定式？

词组get down to sth/doing sth 表示“开始做某事，认真做某事或者重视某事物”，我们 来举两个例子，Let's get down to business. 我们开始办正事吧。It's time I get down to some serious work. 该是我认真干点事情的时候了。所以选择C

to这个词一般情况下只能做介词、副词或动词不定式的标志词（小品词）。
当它后面接动词时，它是小品词；
当它后面接宾语（名词、代词、动名词、副词、介词短语等都可以用作宾语但动词永远不能做宾语）时，它是介词；
当上述两种情况都不符合时，to往往是副词，而且当它做副词时只能表示“苏醒”、“靠岸”等义。

但是对于填空中既有do又有doing的时候，就需要靠平时积累的短语的固定形式用法了

具体有一些TO短语的分类，是介词还是不定式，你自己细细看吧

http://www.cet-46.com/infomation/4000,3011.html

B doing

get down doing something 开始认真做某事

c.get down to
这里的to是介词，当to作介词时，其后接名词或动名词；作不定式时，其后接动词原形。
eg: look forward to doing, to 是介词
plan to do sth. to 是不定式

By getting down___ all these jobs,we can certainly overcome all the difficulties facing us i am getting a problem what must you do before getting off a train A:How's your boy getting on at school? track a plane by radar I spent a few moments getting a general feel for it by a bus与by bus的区别 A Scarlet Letter written by Hawthorn Stopping by Woods on a Snowy Evening Stopping by Woods on a Snowy Evening