单选题（）the visibility to reduce to one mile by heavy rain，it（）be impossible to rescue the vessel in distress.AWas／wouldBWere／wouldCIs／willDIs／is to
单选题
（）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
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