问题
单项选择题
We are enclosing a full set of copy documents ______this first consignment
A. referring
B. covering
C. regarding to
D. as for
答案
参考答案：B
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We are enclosing a full set of copy documents ______this first consignment
A. referring
B. covering
C. regarding to
D. as for
参考答案：B
小鸭自己学会了____________。
小鹰自己学会了____________。