单项选择题

The last place（）in the factory was the tool room.

A. we visited
B. where we visited
C.that visited we
D. we visit

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A programmed computer begins to show on its screen the figures you need（）

A. when switched on
B. switched on
C. to be switched on
D. being switched on
单项选择题
A new technique（）, the gross output increased by 20 percent.

A. working out
B. having worked out
C. having been worked out
D. to have been worked out
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