单项选择题

Robots have already________ human tasks in the industrial field.

A．taken on
B．taken out
C．taken up
D．taken over
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单项选择题
Charles Dickens_________ many wonderful characters in his novels.
A．invented
B．discovered
C．uncovered
D．created
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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