单项选择题

It is very important for every sailor （）the characteristics of the ropes so that they can be for right jobs.

A.knowing
B.know
C.to know
D.knew

点击查看答案&解析

上一题目录下一题

单项选择题

A. has repaired
B. is under repair
C. was repaired
D. had repaired

单项选择题

A. dismantling and inspecting
B. dismantled and inspected
C. to dismantle and inspect
D. dismantle and inspect

单项选择题

A.step
B.shackle
C.chain
D.cable