单项选择题

Among the 15-year-old children, some ______ be studying in university while others are still learning to read and write.

A．should
B．would
C．can
D．must
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单项选择题
The wild flowers looked like a soft orange blanket ______ the desert.
A．covering
B．covered
C．cover
D．to cover
单项选择题
He has lived in London and New York, but he doesn't like ______ city.
A．neither
B．either
C．both
D．all
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