-----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(shí)間狀語until seven o’clock this morning可知, 前面用過去進(jìn)行時(shí)。本題注意不要受思維定勢(shì)的影響而用現(xiàn)在完成進(jìn)行時(shí)，要深入體會(huì)動(dòng)作的時(shí)間性。
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