The teacher is busy ____ teaching.A.withB.forC.onD.of

The teacher is busy ____ teaching.A.withB.forC.onD.of

题型:不详难度:来源:
The teacher is busy ____ teaching.
A.withB.forC.onD.of

答案
A
解析

举一反三
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A.onB.inC.during D.by

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A.butB.exceptC.except forD.without

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A.at,withB.at,forC.with,forD.with,about

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A.byB.aboutC.atD.on

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A.at;onB.at;atC.on;inD.of;to

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