China's reform and opening has been going on for ________ is like about 30 years now and it's really quite remarkable.
| A．that | B．which |
| C．what | D．it |
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China's reform and opening has been going on for ________ is like about 30 years now and it's really quite remarkable.
| A．that | B．which |
| C．what | D．it |
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