It'snecessaryforthephubbers（低头族）to    thetimetheyspendo...

问题详情：

It's necessary for the phubbers（低头族）to     the time they spend on their smart phones．

A．cut in  B．cut off C．cut down  D．cut up

【回答】

C

知识点：动词和动词短语

题型：选择题