单项选择题

It was a toy plane ______ John bought for his son yesterday.

A．what
B．who
C．that
D．why
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单项选择题
Maximum benefits range from $ 50,000 to $ 250,000 ,though some ______ have no limit.
A．policies
B．bills
C．charges
D．prices
单项选择题
The ______ stuck on the outside of the envelope says By Air .
A．label
B．ticket
C．signal
D．advertisement
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