单项选择题

He gave no opinion about the matter because he didn't want to risk ______in it.

A．to involve
B．being involved
C．to be involved
D．involving
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单项选择题
______ is one of good properties of this metal.
A．Light in weight
B．Having been light in weight
C．Be light in weight
D．Being light in weight
单项选择题
——That car must have cost a lot of money.——Oh, no, ______.
A．it mustn't
B．it hasn't
C．it doesn't
D．it didn't
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