单项选择题

A．When crop failure caused depression.
B．When the autumn harvest had just been completed.
C．When the wheat prices became increasingly high.
D．As soon as the Winnipeg Grain Exchange demanded payment:
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How often did the small theater company do a new play
单项选择题
A．A specialist in oil-spill prevention.B．A TV reporter.C．An oil company technician.D．The head of the oil company.
A．A specialist in oil-spill prevention.
B．A TV reporter.
C．An oil company technician.
D．The head of the oil company.
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