12．--Do you know Mr Black        by the police？
--Yes．He's believed to have killed a woman～（　　）
A．wantsB．is wantedC．is wantingD．has wanted

分析 --你知道警察在找布萊克先生嗎？
--是的，有人相信他殺害了一名婦女．

解答 答案：B．
首先根據(jù)語(yǔ)境推測(cè)問(wèn)句的句意是"你知道警察在找布萊克先生嗎？"，由于句子表述的是現(xiàn)在的客觀事實(shí)，所以用一般現(xiàn)在時(shí)，主語(yǔ) Mr Black  是動(dòng)作want 的承受者，所以用被動(dòng)語(yǔ)態(tài)，一般現(xiàn)在時(shí)被動(dòng)語(yǔ)態(tài)的構(gòu)成是：主語(yǔ)+am/is/are+動(dòng)詞的過(guò)去分詞，故選B．

點(diǎn)評(píng) 本題考查時(shí)態(tài)和語(yǔ)態(tài)．每個(gè)時(shí)態(tài)都有標(biāo)志詞，熟記這些標(biāo)志詞是做題的關(guān)鍵．在沒(méi)有時(shí)間狀語(yǔ)的情況下可以根據(jù)語(yǔ)境來(lái)對(duì)時(shí)態(tài)做出判斷．判斷語(yǔ)態(tài)的關(guān)鍵則是觀察主語(yǔ)是謂語(yǔ)動(dòng)詞的執(zhí)行者還是承受者．

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