单项选择题

I tried to call you lost night but your line was______.

A．occupied
B．taken
C．connected
D．engaged
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单项选择题
The role those anthropologists ______ to evolution is not of dictating the details of human behavior but one of imposing constraints.
A．owed
B．ascribed
C．accredited
D．contributed
单项选择题
The motion of ocean water ______ at different depths below the surface.
A．modifies
B．varies
C．alters
D．differs
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