We have been excavating layers of ash almost six metres thick, which suggests that they________the fire burning all winter.
| A．should keep | B．might have kept | C．should have kept | D．might keep |
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We have been excavating layers of ash almost six metres thick, which suggests that they________the fire burning all winter.
| A．should keep | B．might have kept | C．should have kept | D．might keep |
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