单项选择题

--Have you mended your shoes, Bob.
--Yes, I ______ them twenty minutes ago.

A．have mended
B．mended
C．had mended
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My brother isn't at home; he ______ to Qinghai Lake.
A．has gone
B．has been
C．goes
单项选择题
Where is ______ key to the door, Jim
A．a
B．the
C．x
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