单项选择题

The workers are busy______ models for the exhibition.

A．to make
B．with making
C．being making
D．making
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单项选择题
I believe that every crime, ______the circumstance, should be severely punished.
A．in spite of
B．because of
C．instead of
D．on account of
单项选择题
The mother didn't know ______to blame for the broken glass as it happened while she was out.
A．who
B．when
C．how
D．what
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