单项选择题

______ you understand this rule, you'll have no further difficulty.

A．Once
B．Unless
C．Only
D．Until
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单项选择题
A．The police caught the thief within three months.B．The police had still not managed to catch the thief three weeks later.C．The police caught the thief three weeks later.
A．The police caught the thief within three months.
B．The police had still not managed to catch the thief three weeks later.
C．The police caught the thief three weeks later.
单项选择题
A．Canada.B．Australia.C．Italy.
A．Canada.
B．Australia.
C．Italy.
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