（）the visibility to reduce to one mile by heavy rain，it（）be impossible to rescue the vessel in distress.<br>A:Was／would<br>B:Were／would<br>C:Is／will<br>D:Is／is to

（）the visibility to reduce to one mile by heavy rain，it（）be impossible to rescue the vessel in distress.
A:Was／would
B:Were／would
C:Is／will
D:Is／is to

出自：海船船员证

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