Had they known what was coming next, they________   second thoughts.

A．may have

B．could have

C．must have had

D．might have had

______是在想象的基础上发展引申而产生的又一种审美活动，它是由一种已经产生的感觉引起另一种感觉的兴奋，是人的视觉、听觉、嗅觉和触觉等互通和相互转换的效应。