22．If we know more about _______causes the problem, we may take measures before it is _______late.
| A．what; too | B．which; very | C．that; already | D．that; so |
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22．If we know more about _______causes the problem, we may take measures before it is _______late.
| A．what; too | B．which; very | C．that; already | D．that; so |
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