问题
选择题
Please at once after all of you have finished your homework.
A．hand them out
B．hand them in
C．hand it in
D．hand it out
答案
C
题目分析：句意：请在你们都完成家庭作业后，马上交上。homework 为不可数名词，应该用it代替。hand in上交；hand out伸出。选C。
考点: 考查动词短语的用法。