单项选择题

The work（）by the time you decide to cooperate with us.

A. will have been done
B. was done
C. had been done
D. has done

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单项选择题
The teacher demanded （）a lot of time practising our spoken English out of class.

A. us to spend
B. us that we should spend
C. us spending
D. that we spend
单项选择题
______ are that new machine will arrive tomorrow.
A. Opportunities
B. Occasions
C. Chances
D. Times
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