问题
选择题
The boy found a wallet on the ground and stopped _________.
A.picking it up
B.picking up it
C.to pick it up
D.to pick up it
答案
答案:C
stop to do sth 表示停下去做另一件事,同时,pick ···up为动词+adv的情况,如果其宾语为人称代词时,需位于二者之间,故选C