In the event of any quarantinable disease breaking out during its currency，the certificate of pratique generally （）.<br>A:becomes null and void<br>B:remains effective<br>C:is to be extended<br>D:is to renewed

In the event of any quarantinable disease breaking out during its currency，the certificate of pratique generally （）.
A:becomes null and void
B:remains effective
C:is to be extended
D:is to renewed

出自：海船船员证

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