Although the teacher had told Bob the history of telephone, Bob didn’t know when ____.
A．it was inventB．was it inventedC．it was inventedD．it invented
C
考查賓語(yǔ)從句和被動(dòng)語(yǔ)態(tài)。句意為：盡管老師給鮑勃講了電話的歷史，但他還是不知道電話是什么時(shí)候發(fā)明的。首先，賓語(yǔ)從句要用陳述句的語(yǔ)序，即：連接詞+主語(yǔ)+謂語(yǔ)+其他，所以B不對(duì)；另外，it（電話）是invent（發(fā)明）的承受者，所以要用被動(dòng)語(yǔ)態(tài)（be+過(guò)去分詞）。故選C。
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