单项选择题

A．as
B．what
C．which
D．it
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单项选择题
A．Brother and sister.B．Doctor and patient.C．Teacher and student.D．Interviewer and interviewee.
A．Brother and sister.
B．Doctor and patient.
C．Teacher and student.
D．Interviewer and interviewee.
单项选择题
A．materialsB．metalsC．reservesD．fuels
A．materials
B．metals
C．reserves
D．fuels
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