单项选择题

(2008) Why Maria didn’t come to school yesterday______not known.

A．were
B．are
C．is
D．have been
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单项选择题
(2005)The number of people invited_____fifty, but a number of them _____ absent for different reasons.
A．were; was
B．was; was
C．was; were
D．were; were
单项选择题
(2004)____quite capable of working out this problem.
A．Either of the children is
B．Either of children are
C．Either of the children are
D．Either of children is
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