单项选择题

In putting the picture into the envelope, ( )

A、it tore
B、it was torn
C、I have it torn
D、I tore it
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It is important that the aeroplane ( )as light as possible.
A. was
B. be
C. is
D. were
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() describes the way in which government purchases goods and services through electronic media such as Internet.
A、autioner
B、government to business
C、broadcaster
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