堆码场地高于地面并需垫高40cm的堆码作业称为（）。
A.库房内堆码
B.货棚内堆码
C.集装箱堆码
D.露天场地堆码
参考答案：D
单项选择。
You don't need ____ here every day. [ ]
A. come
B. to come
C. coming
D. came
