If you want to look around （从句）,（主句我谓语是try）try the London street pavement for the best value and for the best show in town-Londoners going（这个是非谓语做独立结构） about their daily business.
在这个句子中Londoners going about their daily business
表伴随状况或补充说明时,相当于一个并列句,通常放于句末.
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