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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单项选择题
There are some ______ between their two descriptions; we are puzzled which we should believe.
A．discrepancies
B．distractions
C．diversions
D．discretion
单项选择题
After several nuclear disasters, a ______ has raged over the safety of nuclear energy.
A．quarrel
B．suspicion
C．verdict
D．controversy
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