单项选择题

The number of students in a foreign languages class ______ usually limited to no more than thirty.

A．have
B．are
C．is
D．were
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单项选择题
It was a toy plane ______ John bought for his son yesterday.
A．what
B．who
C．that
D．why
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
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