单项选择题

M: I’ll have these shoes. Please tell me how much I owe you.
W: They are＄40 a pair and three pairs make a total of ＄120. But today we offer a 10% discount.
How much does the man have to pay（）

A. ＄120.
B. ＄108.
C. ＄90.

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They worked（）day and（）night and were paid by（）hour.

A. /; /; /
B. the; /; the
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The flood did not start to（）until two days after the rain had stopped.

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