I haven’t had a phone in the house for three weeks now and it’s several days I used a ph

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。