17. at the gate of the theatre he found the ticket for the play was left at home.A. To ar

问题补充：

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：

A. To arrive

(答案→)B. On arriving

C. As arriving

D. While arriving

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