单项选择题

A．Steel cables.
B．Guide rails.
C．An open carriage.
D．Strong ropes.
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单项选择题
A．Giving advice.B．Presentation.C．Discussion.D．Independent thinking.
A．Giving advice.
B．Presentation.
C．Discussion.
D．Independent thinking.
单项选择题
A．At five o’clock.B．At five thirty.C．At four thirty.D．At four o’ clock.
A．At five o’clock.
B．At five thirty.
C．At four thirty.
D．At four o’ clock.
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