问题
单项选择题
You must（）your cable from 6 shackles to 3 shackles.
A.cut
B.pay out
C.slack
D.shorten
答案
参考答案：D
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You must（）your cable from 6 shackles to 3 shackles.
A.cut
B.pay out
C.slack
D.shorten
参考答案：D