let him do it alone,_____?will hewon't hewill youwon't I

let him do it alone,_____?will hewon't hewill youwon't I
let him do it alone,_____?
will he
won't he
will you
won't I

let him do it alone,_____?will hewon't hewill youwon't I
will you

shall we

shall we?
let的句子翻译疑问句动用“shall we”

应该选择“will you”。
这个句子可以还原为正常的语序是：Will you let him do it alone?
句意是：你想要他独自完成吗？
其他选项不符合常理，这应该是两人之间的对话，所以选择“will you”。

will you
这是let 祈使句常用反意问句的用法。