A in B to C of D for
busy
作形容词,意为忙的,繁忙的.其反义词为free(自由的,有空的).可构成词组
be busy with sth = be busy (in) doing sth 忙于做某事.
Im busy with my homework.我忙于做家庭作业.
= Im busy in doing my homework.
All the people are busy _____ their work.
A on B do C with D does
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