问题补充:
I haven’t had a phone in the house for three weeks now, and it’s several days I used a phone box last time.
A. as
B. when
C. if
D. since
答案:
A. as
B. when
C. if
(答案→)D. since
解析:句意:现在我家里有三个星期没有电话了,自从我最后一次用手机已经有几天了。这里使用的是It is/has been+一段时间+since…“自从…到现在有多久了…”选D。