题目内容
(请给出正确答案)
[单选题]
The London Underground is a rapid transit system in the United Kingdom, _____ a large part of Greater London.
A.serve
B.serves
C.serving
D.to serve
提问人:网友lixin080108
发布时间:2022-01-07
A.serve
B.serves
C.serving
D.to serve
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