（浙江卷9）. It is uncertain __ side effect the medicine will bring about, although about two thousand pat
ients have taken it.
| A．that | B．what | C．how | D．whether |
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（浙江卷9）. It is uncertain __ side effect the medicine will bring about, although about two thousand patients have taken it.
| A．that | B．what | C．how | D．whether |
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