All means that _____ possible _____ been used to save himA.is; have B.were; have C.was; has D.are; hasB.为什么?

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All means that _____ possible _____ been used to save himA.is; have B.were; have C.was; has D.are; hasB.为什么?
All means that _____ possible _____ been used to save him
A.is; have B.were; have
C.was; has D.are; has
B.为什么?

All means that _____ possible _____ been used to save himA.is; have B.were; have C.was; has D.are; hasB.为什么?
相当于All means( that were possible) have been used to save him
因为All means所以要have ,were

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