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
He found it necessary for us______ from each other.
A．to help and learn
B．helping and learning
C．to learn and to help
D．learning and helping
单项选择题
Our team______ the match yesterday.
A．won
B．beat
C．defeated
D．caught
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