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

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

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

D

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。