Building that railway was very difficult and involved ---- t
Building that railway was very difficult and involved ---- ten tunnels
A) dig B) having dug
C) to have dug D) digging
答案是选B,想问下为什么不选D答案是选B,想问下为什么不选D 麻烦请详细回答,
A) dig B) having dug
C) to have dug D) digging
答案是选B,想问下为什么不选D答案是选B,想问下为什么不选D 麻烦请详细回答,
赞 yanjia1108 幼苗
共回答了15个问题采纳率：86.7% 举报
这个题目的意思是修建铁路是很困难的,包括挖十条隧道.
意思是已经修好了,十条隧道已经存在了,那么挖这个动作以经完成,所以应该用完成时态
意思是已经修好了,十条隧道已经存在了,那么挖这个动作以经完成,所以应该用完成时态
1年前
2
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