【题目】Where and when to go for the holiday still ____
A.are remained to decide
B.is remaining to decide
C.remain to be decided
D.remains to be decided

【答案】D
【解析】考查动词时态和非谓语动词。因为remain这个词本身无进行时和被动，remain to be done使处于某种状态，remain在这里是连系动词；Where and when to go相当于主语从句，主语从句做主语后面的谓语动词用单数形式。句意：什么地点什么时间去度假还没定下来。故选D。