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When you are at home,give a call to let me know you            safely.
A.are arrivingB.have arrived
C.had arrivedD.will arrive
B

试题分析: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。
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