They are still very cautious about ______ side effect the new medicine will bring about, although the experts have tried it on about 2,000 patients.
| A．which | B．that | C．where | D．what |
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They are still very cautious about ______ side effect the new medicine will bring about, although the experts have tried it on about 2,000 patients.
| A．which | B．that | C．where | D．what |
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