—I have been waiting for you so long. —Sorry, I have been in the library, ______

题干

—I have been waiting for you so long.
—Sorry, I have been in the library, _______ my friend look for some books.

A．helped

B．helping

C．to help

D．help

上一题下一题 0.15难度单项选择更新时间:2012-07-03 06:55:17

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