赞题库-背景图

单项选择题

For your own ______, please fasten your belts before the plane takes off.

A．safeguard
B．save
C．safety
D．safenor

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热门试题

单项选择题There are no less than 3,000 students ______ Chinese here.

A．study
B．to study
C．studied
D．studying