单项选择题

Metals, valued by weight, ______ coins in many parts of the world.

A．preceded
B．perceived
C．performed
D．precipitated
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单项选择题
Clearly, if we ______ in the class we must communicate with our classmates.
A．participate
B．are to participate
C．will participate
D．do participate
单项选择题
The Buckingham Palace is the place ______ almost all tourists cannot afford to miss when in London.
A．where
B．which
C．of which
D．with which
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