单项选择题

Had he been given some information, he ______ the questions.

A．answered
B．could have answered
C．answers
D．was answering
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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
单项选择题
A．onB．overC．byD．during
A．on
B．over
C．by
D．during
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