单项选择题

I was just lying down when I heard someone ______ on the window.

A．break
B．try
C．hit
D．knock
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单项选择题
Mary was ______ to see so many roses in front of her room.
A．surprising
B．surprise
C．surprised
D．surprisingly
单项选择题
This program ______ your patience and confidence.
A．calls for
B．calls on
C．calls at
D．calls about
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