单项选择题

We have got only five textbooks for the children ______ we need ten. So I'm afraid they will have to share.

A．because
B．since
C．when
D．once
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It was nine o'clock ______ I arrived at the airport.
A．that
B．before
C．when
D．since
单项选择题
______ I wrote a little poem, I confidently placed it right on my father's plate on the dining room table.
A．The first time
B．At first
C．It was the first time
D．For the first time
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