单项选择题
A. pass from B. enter C. come from D. pass through
--Let go the towing line. –Yes ,I will （）.A. let go itB...
--Let go the towing line. –Yes ,I will （）.
A. let go it B. let go to it C. let it go D. let go for it
Slack （）the head line !A.downB.inC.outD.away
单项选择题Slack （）the head line !
A.down B.in C.out D.away
（）the line tight!A.KeepB.MakeC.HaveD.Let
单项选择题（）the line tight!
A.Keep B.Make C.Have D.Let
