foreign visitors could be only( )in some large citiesA.seeB.seeing C.sawD.seen

问题描述:

foreign visitors could be only( )in some large cities
A.see
B.seeing
C.saw
D.seen

D.
can be done是固定结构…表示被…
句子意思:外国人只有在大城市里才会被看见。
而不是:外国人只有在大城市里才会看见。

D

D (be seen是被看见)