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(gè)病人服用這個(gè)藥，但是對(duì)于其帶來(lái)具體什么副作用還是不明確．

解答 答案：B，bring about sth，sth作賓語(yǔ)，這里用連接代詞來(lái)作賓語(yǔ)，而因?yàn)槭莝th，因而可以用連接代詞what．所以選擇B．

點(diǎn)評(píng) 該句中it是形式主語(yǔ)，后面的從句是主語(yǔ)從句，在從句中side effect缺少修飾定語(yǔ)，所以分析從句中的句子成分可以幫助解決問(wèn)題．

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