It is uncertain _______ side effect the medicine will bring about,although about two thousand patients have taken it.
A．thatB．whatC．howD．whether
B
考查連詞。What“什么樣的”做定語，限定side effect。“雖然兩千多病人使用過這種藥，但是會帶來什么樣的副作用還不確定�！�
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