（）, the following possible causes should be investigated.<br>A:Should the engine stop without apparent reason<br>B:The engine should stop without apparent reason<br>C:The engine stops without apparent reason<br>D:The engine is stopped without apparent reason

（）, the following possible causes should be investigated.
A:Should the engine stop without apparent reason
B:The engine should stop without apparent reason
C:The engine stops without apparent reason
D:The engine is stopped without apparent reason

出自：海船船员证

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