单项选择题

He attends to the （）of important business himself.

A．transaction
B．transition
C．transmission
D．transformation

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单项选择题
During their first teacher training year, the students often visited local schools for the of lessons. （）

A．observation
B．investigation
C．inspection
D．examination
单项选择题
Mary once （）with another musician to compose a piece of pop music.

A．merged
B．collaborated
C．coincided
D．constituted
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