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【参考答案】

a→an
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单项选择题
A．Only students who have time for the work.B．All the students who are at the meeting.C．Only students who have a telephone.
A．Only students who have time for the work.
B．All the students who are at the meeting.
C．Only students who have a telephone.
单项选择题
A．Four.B．Five.C．Six.
A．Four.
B．Five.
C．Six.
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