单项选择题

A．A book.
B．A mobile phone.
C．A shirt.
D．A chair.
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单项选择题
A．Yes, I was.B．No, he didn’t.C．No, I didn’t.D．Yes, I would.
A．Yes, I was.
B．No, he didn’t.
C．No, I didn’t.
D．Yes, I would.
单项选择题
The 19th century ______the development of industry.
A) witnesses
B) is witnessing
C) witnessed
D) have witnessed
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