高一英语用介词+关系代词填空

题目

高一英语用介词+关系代词填空
Can you see the speaker_________ ___________ comes the voice,"Can i help you"?
I will never forget the days_________ _________ we worked together in a foreign country.
Nearby were two boats__________ ________ they had come to the lonely island
I'll never forget the soldier________ ________ i was saved from the river on a freezing morning.

答案

from whom
during which
in which
by whom