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Bettergoandaskhimwhenhe.Wemustseehimoffwhenhe.[]A.isleaving;leavesB.leaves;isleavingC.leaves;leftD.left;wasleaving

题目详情
Better go and ask him when he _____ . We must see him off when he _____.              
[     ]
A. is leaving; leaves                
B. leaves; is leaving
C. leaves; left                    
D. left; was leaving
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答案和解析
A