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问题: 英语题

Building that railway was very difficult and involved ________ ten tunnels.
A) dig
B) having dug
C) to have dug
D) digging
请问选哪个,为什么呀

解答:

D.这个句子可以拆开看,builiding the railway很显然是这里的主语。and则连接了两个谓语动词。这题其实就是考Building the railway was involved ...ten tunnels. 这里的省略部分应该是in digging。答案中是用了这个句型的简略形式,省略了in。