单项选择题

Study English hard, ______ you'll fail the exam.

A．or
B．so
C．and
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单项选择题
Yesterday I ______ a book in the school library.
A．borrowed
B．borrow
C．was borrowing
单项选择题
I went to the supermarket ______ Sunday morning.
A．at
B．on
C．in
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