To finish the work in time,he should work harder.(划线部分提问)下划线加在To finish the work in time

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To finish the work in time,he should work harder.(划线部分提问)
下划线加在To finish the work in time

what should he work harder for?
Why should he work harder?

what should he work harder for?
这题目的句子不好。。。。

Why should he work harder?