Where is my bike?It was outside the house.It__C__!
A disappears B is disaappeared C has disappeared D was disappearedWhy?现在完成时态表示过去发生的动作对现在造成的影响或结果，现在的结果是，不知道在哪里，可知，不见了。于现在有联系，所以用此时态。