关于这道选择题的答案和解析

关于这道选择题的答案和解析
The student_____forward to going abroad for further study.
A、referred to looksB、referred to look
C、refers to look D、referring to look
帮我解析哦
_____in the mountains for a week,the two students were finally saved by the local police.
A、Having lost B、Lost
C、Being lostD、Losting
_____in a while unform,he looks more like a cook than a doctor.
A、Dressed B、To dress
C、DressingD、Having dressed
上课没认真听讲，写下的答案是C、B、A，但是不太确定。
顺便帮我解析呀。
谢了。