单项选择题

In Boston, as in the rest of the United States, _______ schooling begins at age, 5 and ends at 16.

A．oblidged
B．compulsory
C．compelling
D．forced
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单项选择题
It is necessary that an efficient worker _______ his work on time.
A．accomplishes
B．can accomplish
C．accomplish
D．has accomplished
单项选择题
China started its space industry only in recent years, and should _______ no lime in catching up.
A．delay
B．lag
C．lessen
D．lose
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