—Jane, have you finished yourpaper?     
—No, I      my sister with her homework all the morning.
A．helpB．have been helpingC．helped D．was helping
B
考查時態(tài)。根據(jù)句意及時間狀語all the morning可知，我一直在幫助，故用現(xiàn)在完成進(jìn)行時，選B。
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