问题
选择题
— Hi! John, would you like to play football with us?
— Oh，I can’t. I ___ my lesson all the morning and still need half an hour.
A．am reviewing
B．have been reviewing
C．have reviewed
D．reviewed
答案
答案：B
根据时间all the morning，一整个上午到现在一直在复习功课。所以用现在完成进行时，选B。