The computer         in 1946 in America.
A．is inventedB．was inventedC．inventsD．invented
B

試題分析：句意:電腦是1946年在美國(guó)被發(fā)明的。根據(jù)句意可知這是一件過(guò)去的事情了，而且句子的主語(yǔ)computer 與invent 之間構(gòu)成被動(dòng)的關(guān)系，故應(yīng)使用被動(dòng)語(yǔ)態(tài)。一般過(guò)去時(shí)的被動(dòng)語(yǔ)態(tài)應(yīng)是was/were + 過(guò)去分詞。故選B。A選項(xiàng)是一般現(xiàn)在時(shí)的被動(dòng)語(yǔ)態(tài)；C是一般現(xiàn)在時(shí)，D是一般過(guò)去時(shí)，兩項(xiàng)沒(méi)有用被動(dòng)語(yǔ)態(tài)。
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