单项选择题

______ a reply, he decided to write again.

A．Not receiving
B．Receiving not
C．Not having received
D．Having not received
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单项选择题
Lincon looked as though he ______ ill for a long time.
A．were
B．was
C．was been
D．had been
单项选择题
Our department has a large collection of books, ______ are in English.
A．many of which
B．many of them
C．many ones
D．their many
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