8．I'm puzzled why he ______ back to me．He should have heard from me．（　�。�
A．hasn't writtenB．didn't write
C．doesn't writeD．hasn't been writing

分析 我不明白他為什么沒(méi)給我回信，他早該收到我的來(lái)信了．

解答 答案：A
根據(jù)"He should have heard from me"可知，他已經(jīng)收到我的來(lái)信了；因此這里應(yīng)表示過(guò)去的動(dòng)作（他收到我的來(lái)信）對(duì)現(xiàn)在造成的結(jié)果，即他還沒(méi)給我回信；故應(yīng)使用現(xiàn)在完成時(shí)；D．現(xiàn)在完成進(jìn)行時(shí)；表示從過(guò)去某時(shí)間開(kāi)始，一直延續(xù)到現(xiàn)在，并且還有可能持續(xù)下去的動(dòng)作；而此處并不強(qiáng)調(diào)動(dòng)作的持續(xù)性，故選A

點(diǎn)評(píng) 本題考查了現(xiàn)在完成時(shí)的用法．做本題時(shí)，首先應(yīng)根據(jù)句意，判斷空缺處的動(dòng)作發(fā)生的時(shí)間以及所表達(dá)的意義；其次，應(yīng)注意區(qū)分現(xiàn)在完成時(shí)與現(xiàn)在完成進(jìn)行時(shí)的用法區(qū)別；因此，做類似的時(shí)態(tài)題時(shí)，需要熟練掌握各時(shí)態(tài)所表達(dá)的意義及用法．

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