问题
选择题
.
._____ the mud from your shoes before coming in, or you will make the floor dirty.
A．Removing
B．To remove
C．Removed
D．Remove
答案
答案：D
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.
._____ the mud from your shoes before coming in, or you will make the floor dirty.
A．Removing
B．To remove
C．Removed
D．Remove
答案：D