The house is dirty because it since they moved out.
A. doesn't clean
B. isn't cleaned
C. hasn't cleaned
D. hasn't been cleaned
网友回答
A. doesn't clean
B. isn't cleaned
C. hasn't cleaned
(答案→)D. hasn't been cleaned
解析：D 考察动词时态和语态。句义：—房子很脏，因为自从他们搬出去以后就没有打扫过。空格处于主语the house之间是逻辑上的被动关系，由此可以排除AC项。根据句中的状语since they moved out，并结合语境可知，空格处应该使用现在完成时，表示过去发生的某一动作对现在语境造成的影响或结果。故D正确。