_____ is even important _____ as the earth cooled down, water began to appear on its surface.
| A．That, which | B．What, that |
| C．What, what | D．It, that |
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_____ is even important _____ as the earth cooled down, water began to appear on its surface.
| A．That, which | B．What, that |
| C．What, what | D．It, that |
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