单项选择题

If you keep getting wrong numbers, your phone could be _______.

A．deceptive
B．defective
C．deficient
D．ineffective
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单项选择题
Henry felt so hungry that he ordered a double,______ of fish.
A．piece
B．part
C．portion
D．section
单项选择题
It was unusual for there ______ so few students in the classroom.
A．to be
B．be
C．being
D．are
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