单项选择题


A．it had
B．to have been
C．it to be
D．it was
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单项选择题
A．answerB．questionC．touchD．refer
A．answer
B．question
C．touch
D．refer
单项选择题
A．made outB．looked toC．clear upD．classify
A．made out
B．looked to
C．clear up
D．classify
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