When you are at home，give a call to let me know you safely．
A. are arriving
B. have arrived
C. had arrived
D. will arrive
网友回答
A. are arriving
(答案→)B. have arrived
C. had arrived
D. will arrive
解析：考查时态：句意：当你到家后，给我个电话让我知道你已经到家了。When you are home是现在时,而主句give a call to let me know 是现在是时,因此其宾语从句也应该与其保持一致用现在时you have arrived safely 选B。