问题补充：
---Mum , May I borrow your camera ?
--- Sure ,here it is .
A. please help me
B. can I ask a favour ?
C. where is your camera ?
D. excuse me .
答案：
A. please help me
(答案→)B. can I ask a favour ?
C. where is your camera ?
D. excuse me .
解析：please help me请帮我一把；can I ask a favour ?可以帮个忙吗？where is your camera ?你的相机在哪儿？ excuse me .打扰了。根据下文，当然了，给你。可知上文说的是，妈妈，可以帮个忙吗？我能借你的相机吗？选项A主语中式表达，故选B。
