单项选择题

Persons who took part in the test were ________.

A．college students
B．twelve men
C．H.M. Clarke and his assistants
D．performers
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单项选择题
The manager wondered why ________.
A．the workman sent a bill to the company
B．the mice bought for the job were a male and a female
C．the workman had paid for the mice
D．mice were needed in repairing a house
单项选择题
The bill was sent to the company by ________.
A．the workman
B．the mice buyer
C．the house owner
D．Bill
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