单项选择题

Caroline ______ her speech when a stranger rushed in and interrupted her.

A．was to finish
B．finished
C．had finished
D．was to have finished
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单项选择题
A．aB．anC．theD．some
A．a
B．an
C．the
D．some
单项选择题
A．questionB．problem'sC．problemsD．problem
A．question
B．problem's
C．problems
D．problem
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