—I hear Sam has gone to Qingdao for his holiday. —Oh, how nice! Do you know when he________?

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问题 —I hear Sam has gone to Qingdao for his holiday.     —Oh, how nice! Do you know when he________?

选项 A、left
B、was leaving
C、has left
D、had left

答案A

解析 由于主句是一般现在时,容易排除B和D。when一般情况下不能和现在完成时连用。
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