单项选择题

They went （） the schedule for the conference again and again until they felt satisfied with every detail of it.

A．out
B．up
C．over
D．by

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单项选择题

（） Hongkong is often regarded as （） international centre for business, finance and tourism.（）

A．/; an
B．An; /
C．The; /
D．/; the

单项选择题

John left home twenty minutes ago. It is usually half an hour's drive from his home to the office here. So he （） soon.

A．should have arrived
B．need arrive
C．must have arrived
D．may arrive

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