The old man found the missing boy ——偶然

问题描述:

The old man found the missing boy ——偶然

accident

by accident

三个任你选~~~~
by accident
by chance
incidentally

by accident 或者 incidentally

应填by accident 或 incidentally 偶然,意外地
The old man found the missing boy by accident (incidentally).
翻译:
这位老人偶然地发现这个失踪的男孩.