单项选择题

You'd better hurry, ______ you might be late for class.

A．or
B．and
C．unless
D．but
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单项选择题
Which is ______, North America or South America
A．biggest
B．the biggest
C．more biggest
D．bigger
单项选择题
All the ______ tourists gave the robber their money.
A．frightened
B．frightening
C．frighten
D．frightful
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