Can you hold the bag for me _________ I open the door

问题描述:

Can you hold the bag for me _________ I open the door
A.because B.since C.while D.for

由于我要开门你可以帮我拿下包么
选B 表示由于
A because 接句子或者用because of
C while 后面一般接正在做
D for 表目的这里不合适