-----Tom. You look very bored and tired.
题型：选择题
问题：
-----Tom. You look very bored and tired.
-----Yes, I ______ my father on the farm until seven o’clock this morning.
A．have been helping
B．had helped
C．was helping
D．am helping
-----Tom. You look very bored and tired.
-----Yes, I ______ my father on the farm until seven o’clock this morning.
A．have been helping
B．had helped
C．was helping
D．am helping