问题
单项选择题
All the holds to be familiar with the survival craft’s（）.
A.cleanly/during
B.clear/meawhile
C.clean/between
D.clean/prior to
答案
参考答案：D
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All the holds to be familiar with the survival craft’s（）.
A.cleanly/during
B.clear/meawhile
C.clean/between
D.clean/prior to
参考答案：D
