单项选择题

—Why do you want the book so much
—______，sir．

A．Studying
B．Studies
C．Studied
D．To study
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单项选择题
I received his mother's telephone call at eleven, ______ that he was badly hurt in an accident yesterday.
A. Then did I know
B. Only then I knew
C. Only then did I know
D. Only then knew I
单项选择题
It was ten o'clock ______ he came back home．
A．when
B．that
C．since
D．after
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