单项选择题

He has suffered from this ______ disease for about a couple of years now, no effective medicine for it at the moment.

A．perpetual
B．permanent
C．chronic
D．sustained
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单项选择题
New year is round the corner, every house you visit are beautifully decorated with ______.
A．ornament
B．luxury
C．complement
D．complaint
单项选择题
______ sheep was grazing on the hill and an eye dog was watching them from a far.
A．A herd of
B．A school of
C．A pair of
D．A mop of
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