单项选择题

The building______ by the end of next year will be used as our teaching block.

A．to be completed
B．completed
C．being completed
D．having been completed
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单项选择题
______we have done too much for the chance to come here, we must work hard.
A．Since that
B．For
C．As
D．Because of
单项选择题
I don't believe that your sister can speak two foreign languages,______
A．do I
B．can't she
C．don't I
D．can she
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