It'snecessaryforthephubbers(低頭族)to   thetimetheyspendon...

問題詳情：

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

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

【回答】

C

知識點：動詞和動詞短語

題型：選擇題