( ) short of trucks, they had to carry the machine parts to t

( ) short of trucks, they had to carry the machine parts to the worksite with their hands or on their backs.
A、To be
B、Been
C、Being
D、To have been
【正确答案】：C
【题目解析】：非谓语动词做状语，句子含义是由于没有卡车，他们通过自己的双手或背将零部件运往工地。