问题补充:
---There is a book on the ground.
---Let’s and ask who lost it.
A. lies, pick it our
B. lying, pick it up
C. to lie, pick up
D. lying,pick out it
答案:
A. lies, pick it our
(答案→)B. lying, pick it up
C. to lie, pick up
D. lying,pick out it
解析:句意:---在地上有一本书,---让我们把它捡起来问问是谁丢的。There be +主语+doing+介词短语,表示某处有某物正做某事,lie的分词是把ie变y+ing, pick up捡起,拾起,如果是代词放在中间,结合语境可知选B。