-----Tom. You look very bored and tired.
-----Yes, I ______ my father on the farm until seven o’clock this morning.
A．have been helpingB．had helpedC．was helpingD．a(chǎn)m helping
C
由表示過去的時間狀語until seven o’clock this morning可知, 前面用過去進行時。本題注意不要受思維定勢的影響而用現(xiàn)在完成進行時，要深入體會動作的時間性。
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