我们的重吊杆已经长时间不用了。（）<br>A:Our derrick has been out of use for a long time.<br>B:Our heavy derrick has been out of use for a long time.<br>C:Our crane has been out of use for a long time.<br>D:Our winch has been out of use for a long time.

我们的重吊杆已经长时间不用了。（）
A:Our derrick has been out of use for a long time.
B:Our heavy derrick has been out of use for a long time.
C:Our crane has been out of use for a long time.
D:Our winch has been out of use for a long time.

出自：船舶水手证

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