Mariners are reminded that they should proceed in the general direction indicated by the arrows or，if（）a lane，they should do so as nearly as practicable at right angles to it.<br>A:cross<br>B:crossing<br>C:crossed<br>D:crosses

Mariners are reminded that they should proceed in the general direction indicated by the arrows or，if（）a lane，they should do so as nearly as practicable at right angles to it.
A:cross
B:crossing
C:crossed
D:crosses

出自：海船船员证

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