Question

Hardly ________ my mail box when I found an e-mail from my teacher．

[　　]

A．

I clicked

B．

I had clicked

C．

had I clicked

D．

did I click

Answer 1

答案：C
解析：

hardly是否定副词，放在句首后面的句子要部分倒装，句子应该使用过去完成时，所以选C。