问题
选择题
17._____ at the gate of the theatre, he found the ticket for the play was left at home.
A．To arrive
B．On arriving
C．As arriving
D．While arriving
答案
答案：B
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17._____ at the gate of the theatre, he found the ticket for the play was left at home.
A．To arrive
B．On arriving
C．As arriving
D．While arriving
答案：B