Question

—How clean the room is!   —Yes，I am sure that someone _______ it.

A．cleans	B．cleaned
C．has cleaned	D．had cleaned

Answer 1

C

试题分析：句意:-这个房间多么干净啊！-是的，我确信有人打扫房间了。clean是一个动词，意思是打扫。根据句意可知，现在房间非常的干净，所以应该是有人已经打扫过了，故应该用现在完成时，故选C。A是一般现在时；B是一般过去时；D是过去完成时。