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题目内容
（国家开放大学商务英语3）
Generally _________, business tax is based on taxable services, the transfer of intangible assets and sale of immovable property within China.
选择一项：
A.
speak
B.
to speak
C.
speaking
选择一项：
A.
speak
B.
to speak
C.
speaking
参考答案