问题
选择题
We are not ready to go into production yet, for the new switch mechanism isn’t fully ______.[ ]
A．tried out
B．tested out
C．worked out
D．turned out
答案
答案：B
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We are not ready to go into production yet, for the new switch mechanism isn’t fully ______.[ ]
A．tried out
B．tested out
C．worked out
D．turned out
答案：B