It does not matter that you are a slow walker you never walk backwards.
A. as long as
B. as soon as
C. unless
D. until
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(答案→)A. as long as
B. as soon as
C. unless
D. until
解析：句意：你走的慢没有关系，只要你不往回走。As long as :只要 as soon as :一...就...；尽快unless:除非until：直到。根据句意选A。