问题
单项选择题
We are a state-owned corporation ______ the export of tablecloths.
A．specialized
B．specializing
C．specialized in
D．specializing in
答案
参考答案：D
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We are a state-owned corporation ______ the export of tablecloths.
A．specialized
B．specializing
C．specialized in
D．specializing in
参考答案：D