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

Our team ______ the match yesterday.

[A] won
[B] beat
[C] defeated
[D] caught

单项选择题

Paul doesn't have to be made ______ He is always a hard-working student.

[A] study
[B] to study
[C] studied
[D] studying

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