单项选择题

—Why are your eyes so red You _______ have slept well last night. —Yeah, I stayed up late writing a report.

A．can’t
B．mustn’t
C．needn’t
D．won’t
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单项选择题
Read this story, ________ you will realize that not everything can be bought with money.
A．or
B．and
C．but
D．so
单项选择题
The traffic on the main streets has a longer green signal than______ on the small ones.
A．one
B．this
C．that
D．it
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