单项选择题

The education of （） young is always （） hot and serious topic.

A. /, /
B. the, a
C. /, the
D. the, the

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单项选择题

A. More than twice
B. as twice many
C. twice as many
D. more than twice as many

单项选择题

A. the moment
B. since
C. before
D. while