Question

Sir, you should ________ at the red light, but you didn’t.

A．stop	B．have to stop
C．have stopped	D．not have stopped

Answer 1

C

考察虛擬語氣。句意：先生，你應該在紅燈亮時停，但是你沒有。表示對已發(fā)生的事情的虛擬用shouldn’t have done 故選C。