问题
单项选择题
You can safely step in the bight of a line（）.
A.when it is not under strain
B.if both ends are made fast
C.in an emergency
D.at no time
答案
参考答案：D
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You can safely step in the bight of a line（）.
A.when it is not under strain
B.if both ends are made fast
C.in an emergency
D.at no time
参考答案：D