问题描述：
-What’s that noise? ---Oh, I forgot to tell you.
-What’s that noise?
---Oh, I forgot to tell you. The new machine____.
A. was tested B. will be tested
C. is being tested D. has been tested
-What’s that noise?
---Oh, I forgot to tell you. The new machine____.
A. was tested B. will be tested
C. is being tested D. has been tested
问题解答：
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