单项选择题

21（）

A．easy
B．hard
C．new
D．many

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单项选择题
Automatic machines can only do the jobs they ______ to do.
A．have asked
B．ask
C．have been asked
D．will ask
单项选择题
She has neither read the book nor ______ the film.
A．seen
B．sees
C．see
D．saw
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