摘要： If we know more about causes the problem , we may measures it is late . A. which ; have ; when ; very B. what ; take ; before ; too C. which ; take ; until ; so D. what ; have ; before ; very
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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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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 |