单项选择题

A computer ______ think for itself. It must be told what to do.

[A] can't
[B] couldn't
[C] may not
[D] might not

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单项选择题

It is said that Sally's been painting for years since she was a little girl, ______

[A] isn't she
[B] hasn't it
[C] hasn't she
[D] doesn't it

单项选择题

You're ______ your time trying to persuade him; he'll never join us.

[A] spending
[B] wasting
[C] losing
[D] missing

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