The question______new measures should be taken to control the terrible air pollution is______puzzles scientists a lot.
| A．that; what | B．which; that | C．what; what | D．which; that |
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The question______new measures should be taken to control the terrible air pollution is______puzzles scientists a lot.
| A．that; what | B．which; that | C．what; what | D．which; that |
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