6．It is uncertain __ side effect the medicine will bring about，although about two thousand patients have taken it．（　　）
A．thatB．whatC．howD．whether

分析 句意為：雖然有大約兩千個病人服用這個藥，但是對于其帶來具體什么副作用還是不明確．

解答 答案：B，bring about sth，sth作賓語，這里用連接代詞來作賓語，而因為是sth，因而可以用連接代詞what．所以選擇B．

點評 該句中it是形式主語，后面的從句是主語從句，在從句中side effect缺少修飾定語，所以分析從句中的句子成分可以幫助解決問題．

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