单项选择题


A．are
B．fail
C．have
D．say
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单项选择题
A．problemB．rateC．issueD．degree
A．problem
B．rate
C．issue
D．degree
单项选择题
A．childrenB．theyC．five-year-oldsD．six-year-olds
A．children
B．they
C．five-year-olds
D．six-year-olds
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