单项选择题


A．since
B．because
C．though
D．however
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单项选择题
A．directionB．trainingC．educationD．instruction
A．direction
B．training
C．education
D．instruction
单项选择题
What does the author mean by held back ( Line 1, Para. 1 )
A．Made to stay in the same class.
B．Obliged to study in the lower class.
C．Prevented from advancing.
D．Concentrated on their studies.
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