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給我回信,他早該收到我的來信了.

解答 答案:A
根據(jù)"He should have heard from me"可知,他已經(jīng)收到我的來信了;因此這里應表示過去的動作(他收到我的來信)對現(xiàn)在造成的結(jié)果,即他還沒給我回信;故應使用現(xiàn)在完成時;D.現(xiàn)在完成進行時;表示從過去某時間開始,一直延續(xù)到現(xiàn)在,并且還有可能持續(xù)下去的動作;而此處并不強調(diào)動作的持續(xù)性,故選A

點評 本題考查了現(xiàn)在完成時的用法.做本題時,首先應根據(jù)句意,判斷空缺處的動作發(fā)生的時間以及所表達的意義;其次,應注意區(qū)分現(xiàn)在完成時與現(xiàn)在完成進行時的用法區(qū)別;因此,做類似的時態(tài)題時,需要熟練掌握各時態(tài)所表達的意義及用法.

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