单项选择题
Please return it after （）it.
A.use B.used C.using D.to use
单项选择题 The chief officer is responsible （）the overall maintenance of deck department.
单项选择题 At sea, much of the （）time is spent maintaining the ship and her equipment in good condition.
单项选择题 At sea, much of the sailor’s time is spent （）the ship and keeping her equipment in good condition.
