单选题“Single up forward to headline and spring!” means “ （）”.AUnmoor all lines except the headline and forward spring.BMoor all lines except the headline and forward spring.CHold on all lines except the headline and forward spring.DLet go the headline and forward spring.
单选题
“Single up forward to headline and spring!” means “ （）”.
A
Unmoor all lines except the headline and forward spring.
B
Moor all lines except the headline and forward spring.
C
Hold on all lines except the headline and forward spring.
D
Let go the headline and forward spring.
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