单项选择题

A．to require
B．required
C．requiring
D．are required
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单项选择题
A．When I saw Packer for the first, he told me a lot about himself.B．Packer had been very successful when I saw him for the second time.C．It had taken 26 years to build Fariburn.D．The journey in plane was rather interesting.
A．When I saw Packer for the first, he told me a lot about himself.
B．Packer had been very successful when I saw him for the second time.
C．It had taken 26 years to build Fariburn.
D．The journey in plane was rather interesting.
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