—Sorry，I have to ________ now.It's time for class.
—OK，I'll call b
ack later.
A．hang up B．break up
C．give up D．hold up
—Sorry，I have to ________ now.It's time for class.
—OK，I'll call back later.
A．hang up B．break up
C．give up D．hold up
A [考查动词短语辨析。根据第一个说话者说“该上课了”可知此处选hang up，意为“挂断电话”。break up 打碎，解散，结束，终止关系；give up 放弃；hold up 举起，阻挡，拦截，均与题意不符。]