单项选择题

In the Unites States, it is required that all children______ school, public or private, for 12 years

A．must attend
B．need attend
C．should attend
D．ought to attend
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单项选择题
I spent the next two years investigating the very questions______ by him.
A．posed
B．held
C．put
D．set
单项选择题
Cargoes arrive by road vehicle or by train at a main storage park,______ out with a grid on the ground for the containers.
A．noted
B．impressed
C．marked
D．labeled
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