单项选择题

My son has studied in the university（）last September.

A． for
B． since
C．after

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单项选择题
We（）a lot from the farmers when we stayed with them.

A．knew
B．studied
C．learnt
单项选择题
— Has your sister finished her paper yet— I don't know. She（）it this morning.

A．writes
B．was writing
C．has written
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