问题
选择题
Hello! I'm very glad to see you. When ______ you ______ here? [ ]
A. did; arrive
B. will; arrive
C. have; arrived
D. are; arriving
答案
答案：A
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Hello! I'm very glad to see you. When ______ you ______ here? [ ]
A. did; arrive
B. will; arrive
C. have; arrived
D. are; arriving
答案：A