成人英语三级

单选题The workers are busy __________ models for the exhibition.

A.to make
B.in making
C.being making
D.making

参考答案:D进入在线模考
【参考译文】工人们忙于为展览做模型。
【答案解析】本题考查busy的用法。be busy doing sth.,于做……。故选D。