单项选择题

______ a reply, he decided to write another letter.

A．Not receiving
B．Having not received
C．Not having received
D．Receiving not
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Her ______ qualities, such as her sense of comedy and her appearance, all attracted US.
A．private
B．only
C．personal
D．individual
单项选择题
This is one of the most ______ ways of reducing pollution.
A．effective
B．efficiency
C．effect
D．efficient
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