问题
选择题
Six days had gone by ______ they realized the picture painted by Pablo Picasso was missing.
A. as
B. before
C. since
D. when
答案
答案：B
搜题请搜索小程序“爱下问搜题”
Six days had gone by ______ they realized the picture painted by Pablo Picasso was missing.
A. as
B. before
C. since
D. when
答案：B