Itisapitythattheindustrialcities

問題詳情：

It is a pity that the industrial cities _____________ in the 19th century do not attract visitors.

   A. having been built       B. built                        C. to be built               D. having built

【回答】

B

知識點：虛擬語氣與情態動詞

題型：選擇題