look,there are many foreigners __the great wallA to visit B visitC visited D visiting

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look,there are many foreigners __the great wallA to visit B visitC visited D visiting
look,there are many foreigners __the great wall
A to visit
B visit
C visited
D visiting

look,there are many foreigners __the great wallA to visit B visitC visited D visiting
D

D，look为现在进行时态的标志词，be+v的现在分词形式，故选D，希望对你有帮助