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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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
单项选择题
______ life pace continues to speed up, we are quickly losing the art of enjoyment.
A. With
B. When
C. As
D. While
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