The flag is white red.[ ]
A. but
B. and
C. so
D. inside
答案：B
MRP的中文表述为（）
A．主生产计划
B．制造资源计划
C．物料需求计划
D．企业资源计划
I hear our teacher will be back three weeks' time.
A．at
B．in
C．for
D．after
e back three weeks' time.