问题
选择题
—Jane, have you finished yourpaper?
—No, I my sister with her homework all the morning.
A．help
B．have been helping
C．helped
D．was helping
答案
答案：B
考查时态。根据句意及时间状语all the morning可知，我一直在帮助，故用现在完成进行时，选B。
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