The main tasks for sailors on duty are, first of all,（）the persons who come on board to do their business.<br>A:received<br>B:receives<br>C:receiving<br>D:receive

The main tasks for sailors on duty are, first of all,（）the persons who come on board to do their business.
A:received
B:receives
C:receiving
D:receive

出自：船舶水手证

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