单选题（）, the following possible causes should be investigated.AShould the engine stop without apparent reasonBThe engine should stop without apparent reasonCThe engine stops without apparent reasonDThe engine is stopped without apparent reason
单选题
（）, 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
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