单选题：( ) He gave no opinion about the matter because he didn't wa

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题目内容：
( ) He gave no opinion about the matter because he didn't want torisk__________in it. A．to involve
B．being involved
C．to be involved
D．involving

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( )If a better material__________, the strength of the part would have been incr

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若直线l沿x轴负方向平移3个单位，再沿y轴正方向平移1个单位后，又回到原来的位置，那么直线l的斜率是 A．-1/3 B．一3 C．1/3 D．3

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（ ） at his model plane over the weekend, he did't complete

（ ） at his model plane over the weekend, he did't complete it.A．As he worked ha

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