This is one of the best products that（）sold this year.
A.are
B.have been
C.were
D.was
正确答案：have been
This is one of the best products that（）sold this year.
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Either you or I（）going to the manager's office after work.
The old（）treated badly in some countries.
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- Products in Question Marks have the potential to grow and if investment is made properly， it could easily turn them into（）.
- I am interested in your latest products.。
- Compared with our other products， it is small in size are lighter in weight.。
- Convenience products include（）.
- Business-to-business products include（）.