Ther are busy _____ their work nowA.doingB.to doC.with doing\D.do

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Ther are busy _____ their work nowA.doingB.to doC.with doing\D.do
Ther are busy _____ their work now
A.doing
B.to do
C.with doing\
D.do

Ther are busy _____ their work nowA.doingB.to doC.with doing\D.do
A
be busy doing sth 忙于做某事