It is uncertain ________ side effect the medicine will bring about, although about two thousand patients have taken it.(2010·浙江)
| A．that | B．what | C．how | D．whether |
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It is uncertain ________ side effect the medicine will bring about, although about two thousand patients have taken it.(2010·浙江)
| A．that | B．what | C．how | D．whether |
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