单项选择题

A．do
B．have
C．are
D．those
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单项选择题
A．thatB．whatC．whichD．it
A．that
B．what
C．which
D．it
单项选择题
A．A teacher and student.B．An employer and employee.C．A grandparent and grandchild.D．Two new friends.
A．A teacher and student.
B．An employer and employee.
C．A grandparent and grandchild.
D．Two new friends.
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