All the holds to be loaded with grain must be swept（）commencement of loading.<br>A:Cleanly/during<br>B:Clear/meanwhile<br>C:Clean/between<br>D:Clean/prior to

All the holds to be loaded with grain must be swept（）commencement of loading.
A:Cleanly/during
B:Clear/meanwhile
C:Clean/between
D:Clean/prior to

出自：海船船员证

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