单项选择题

It's a pity that you () leave so soon. It's been so nice having you here.

A．can
B．could
C．should
D．might

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单项选择题

The room contained () equipment including several TV monitors.

A．a tot of
B．a few
C．a number of
D．little

单项选择题

At 13 he was sent to a shop, () he learned the business.

A．where
B．which
C．when
D．that

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