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The use of a time-planning system, ______ key points and periods are plotted, enables managers to organise their activities so that bottlenecks can be avoided and deadlines can be met.
The use of a time-planning system, ______ key points and periods are plotted, enables managers to organise their activities so that bottlenecks can be avoided and deadlines can be met.
A.on which
B.in which
C.that
D.in that
正确答案是A
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