Ann was reading a piece of science fiction,completely ______ to the outside world
问题描述：
Ann was reading a piece of science fiction,completely ______ to the outside world
A.having been lost B.to be lost C.losing D.lost
The computer center,_____ last year,is very popular among the students in this school
A.open B.opening C.having opened D.opened
答
1,选d.因为a用现在完成形式与was reading 过去进行时矛盾,因为它们属于不同的时态区间,现在完成时属于现在时的一种,过去进行时属于过去时态的一种.b选项动词不定式是表示将来的含义,也与过去进行时矛盾.C.losing 在...