When you are at home give a call to let me know yousafelyA. are arrivingB. have arrivedC.

问题补充：

When you are at home，give a call to let me know yousafely．

A. are arriving

B. have arrived

C. had arrived

D. will arrive

答案：

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。