单项选择题

A．in
B．for
C．at
D．of
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D
单项选择题
A．The man’s major is genetics.B．The man and woman are studying together.C．The man sometimes works on more than one project at a time.D．The man has completed one project and started another.
A．The man’s major is genetics.
B．The man and woman are studying together.
C．The man sometimes works on more than one project at a time.
D．The man has completed one project and started another.
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