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．a(chǎn)sB．whenC．ifD．since
D

試題分析：句意：現(xiàn)在我家里有三個星期沒有電話了，自從我最后一次用手機(jī)已經(jīng)有幾天了。這里使用的是It is/has been+一段時間+since…“自從…到現(xiàn)在有多久了…”選D。
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