单项选择题

They used to go shopping in the supermarket run by a foreigner, ______.

A．Mary's mother used to
B．so used Mary's mother
C．so did Mary's mother
D．also Mary's mother
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单项选择题
Tony ______ yesterday if he were really serious about his work.
A．ought to come
B．should come
C．must have come
D．should have come
单项选择题
Sam did nothing else than ______ when he saw the old lady fell down on the ground.
A．stand by
B．standing by
C．stood by
D．stood up
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