单项选择题

Since nobody is answering the phone, they ______.

A．should have left
B．must have left
C．need have left
D．can have left
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单项选择题
The old woman burst into tears at the bad news ______ her son had been killed by the enemy.
A．that
B．when
C．which
D．what
单项选择题
Mr. Brown did not tell us ______ or not he'll be leaving next week.
A．whether
B．if
C．either
D．weather
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