单项选择题

A．signal
B．mark
C．sign
D．symbol
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单项选择题
A．keepB．keepingC．have keptD．kept
A．keep
B．keeping
C．have kept
D．kept
单项选择题
Which of the following is a key predictor of whether students will eventually graduate from college
A．Race.
B．Economic situations.
C．Completion of a rigorous course of study in high school.
D．Involvement in social activities.
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