单项选择题

Agriculture is the country’’s chief source of wealth, wheat _______by far the biggest cereal crop.

A．is
B．been
C．be
D．being
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单项选择题
A．formerB．returnedC．reversedD．regular
A．former
B．returned
C．reversed
D．regular
单项选择题
If the whole opera, on ______ beforehand, a great deal of time and money would have been lost.
A．was not planned
B．has not been planned
C．had not been planned
D．were not planned
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