While the police have already done a lot of investigation, much evidence .
A. is remaining to be confirmed
B. remained to be confirmed
C. is remained to be confirmed
D. remains to be confirmed
网友回答
A. is remaining to be confirmed
B. remained to be confirmed
C. is remained to be confirmed
(答案→)D. remains to be confirmed
解析：考查时态。句意：虽然警方已经做了大量调查，大量证据依然有待确定。可知remain这个动作从过去到现在，还没有结束，故用一般现在时态，选D。