Question

—You shouldn’t have shouted at your mother. It really hurt her.
—Exactly. I ________ crazy at the time.

A．must be

B．could be

C．must have been

D．could have been

Answer 1

C

試題分析：句意：--你不應該對你媽媽大聲說話的。這真的傷害了她。--確實是，我那時一定是發瘋了。從shouldn’t have done說明是過去的事情，所以排除AB，must have done是對過去情況的肯定推測，could have done是“過去本可能做卻沒做“，不符合句意。選C。