单项选择题

It is important that the aeroplane ( )as light as possible.

A. was
B. be
C. is
D. were
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单项选择题
() describes the way in which government purchases goods and services through electronic media such as Internet.
A、autioner
B、government to business
C、broadcaster
D、banner ads
单项选择题
If the maker of a promissory note fails to pay the note on the due date, the note is said to be( )
A、displaced
B、disallowed
C、dishonored
D、dishonored
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