单项选择题

-How did you pay，the workers
-As a rule，they were paid by ______．

[A] the hour
[B] an hour
[C] hour
[D] hours

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单项选择题

Sorry, I can't go with you tomorrow. If I should go, I ______him.

[A] shall see
[B] will see
[C] had seen
[D] would see

单项选择题

We were swimming in the lake suddenly the storm started.

[A] when
[B] while
[C] until
[D] before

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