单项选择题

Nowadays Internet enables us to know things happen almost at the exact moment ______ .

A．which they are happening
B．they are happening
C．which they happen
D．they have happened
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单项选择题
She is the ______ holder of the 3,O00-meter world record, but there is no guarantee that she will win in the Olympic Games.
A．current
B．predominant
C．prevailing
D．prevalent
单项选择题
The experts ______ on the cause of poverty but agree on steps to eradicate it.
A．differ
B．distinguish
C．dissent
D．disperse
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