问题
单项选择题
All dunnage planks and mats must be sent to board（）commencement of loading.
A.prior to
B.during
C.in the period of
D.afterwards
答案
参考答案：A
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All dunnage planks and mats must be sent to board（）commencement of loading.
A.prior to
B.during
C.in the period of
D.afterwards
参考答案：A