第一题：“it is +一段时间+since +过去式”的疑问形式
第二题：unless除非,until直至
第三题：just to be on the safe side为了安全起见,为了遮阳也该用太阳伞sun umbrella
状语从句疑问!几个小题 求讲解“How long do you suppose it is (D) he left fo
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