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istory for nearly 20 years. ? A. teaches B. has taught ? C. is teaching D. will teach ? 【 解析 】 考查現(xiàn)在完成時(shí)態(tài)。句中的時(shí)間狀語 for nearly 20 years要與現(xiàn)在完成時(shí)態(tài)連用,故選 B。 ? 【 答案 】 B ? 考點(diǎn)二:常見的被動(dòng)語態(tài) ? 動(dòng)詞的語態(tài)有兩種:主動(dòng)語態(tài)和被動(dòng)語態(tài)。但在動(dòng)詞中,只有及物動(dòng)詞有被動(dòng)語態(tài)。 ? 常見的被動(dòng)語態(tài)形式如下: 時(shí)態(tài) 被動(dòng)語態(tài) 例句 一般現(xiàn)在時(shí) am/is/are+動(dòng)詞的過去分詞 The flowers are often watered by her. 一般過去時(shí) was/were+動(dòng)詞的過去分詞 A farm was vistied yesterday by us. 一般將來時(shí) will/shall+ be+動(dòng)詞的過去分詞 Some trees will be planted this week by her. 時(shí)態(tài) 被動(dòng)語態(tài) 例句 現(xiàn)在進(jìn) 行時(shí) am/is+ being+動(dòng)詞的過去分詞 A novel is being read by him. 現(xiàn)在完 成時(shí) have/has been+動(dòng)詞的過去分詞 His rooms have been cleaned by him. 過去進(jìn) 行時(shí) was/were being+動(dòng)詞的過去分詞 His rooms were being cleaned by him then. 含情態(tài) 動(dòng)詞 情態(tài)動(dòng)詞+ be+動(dòng)詞的過去分詞 Your homework must be finished in time. ? 【 典例解析 】 ? (2022德陽 )The telephone ______ by Alexander Graham Bell in 1876. ? A. invent B. was invented ? C. is invented D. invented ? 【 解析 】 考查被動(dòng)語態(tài)。句中的主語 telephone是謂語動(dòng)詞invent的作用對(duì)象,因此用被動(dòng)語態(tài),而且句中的時(shí)間狀語 in 1876表示