..Indeed thanks to the good ideas of lots of people like the cycling fans in the 1960s man

问题补充：

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.Indeed,thanks to the good ideas of lots of people,like the cycling fans in the 1960s,many people around the worldthe city centre streets without cars for many years.

A. have enjoyed

B. enjoyed

C. have been enjoying

D. have been enjoyed

答案：

A. have enjoyed

B. enjoyed

(答案→)C. have been enjoying

D. have been enjoyed

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