Question

—Will you stay for some more days?
—Sorry, I_____. My mother called to ask me to go back at once.

A．mustn’t

B．may not

C．can’t

D．wouldn’t

Answer 1

C

情態動詞表推測。句意：－你再呆幾天好嗎？－對不起，我不能，我的母親打電話讓我馬上回去。Mustn’t禁止；may not可能不；wouldn’t不愿做……，將要不……。故選C。