________ several times，but he still doesn't know how to do it correctly.A．Althou

题干

________ several times，but he still doesn't know how to do it correctly.

A．Although I've taught him

B．I've taught him

C．Having been taught

D．Having taught

上一题下一题 0.64难度单项选择更新时间:2014-03-28 01:28:30

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