问题
选择题
Don't open the door _____ it is so cold. [ ]
A. because
B. because of
C. since
D. as
答案
答案：C
搜题请搜索小程序“爱下问搜题”
Don't open the door _____ it is so cold. [ ]
A. because
B. because of
C. since
D. as
答案：C