单项选择题

Hello! I ______ you ______ in London. How long have you been here

A．don't know, were
B．hadn't know, are
C．haven't know, are
D．didn't know, were
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单项选择题
We offered him our congratulations ______ his passing the college entrance exams.
A．at
B．of
C．for
D．on
单项选择题
The students are ______ to hand in the exercises before class.
A．expected
B．hoped
C．agreed
D．promised
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