_________several times, but Mary still has no idea of how to do it properly. A．

题干

_________several times, but Mary still has no idea of how to do it properly.

A．Being shown

B．Having shown

C．Having been shown

D．I’ve shown her

上一题下一题 0.64难度单项选择更新时间:2010-09-21 03:53:04

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