4．It might have saved me some trouble __________ the schedule．（　�。�
A．did I knowB．have I knownC．do I knowD．had I known

分析 它可能已省了我一些麻煩，要是我知道這個(gè)計(jì)劃的話(huà)．

解答 根據(jù)主句謂語(yǔ)動(dòng)詞might have done，可以知道是對(duì)過(guò)去情況的假設(shè)，那么if從句中謂語(yǔ)動(dòng)詞則需用had done來(lái)表示對(duì)過(guò)去情況的假設(shè)，從而使得主從句保持一致．當(dāng)虛擬條件句的謂語(yǔ)動(dòng)詞是助動(dòng)詞had時(shí)，if可以省略，從而將had置于句首，句子倒裝．所以D選項(xiàng)正確．

點(diǎn)評(píng) 此題考查虛擬語(yǔ)氣中if省略倒裝的現(xiàn)象．當(dāng)虛擬條件句的謂語(yǔ)動(dòng)詞含有were，should（助動(dòng)詞），had（助動(dòng)詞）時(shí)，if可以省略，從而將were，should（助動(dòng)詞），had（助動(dòng)詞）置于句首，句子倒裝．解此類(lèi)題時(shí)，要根據(jù)語(yǔ)境、時(shí)間狀語(yǔ)或主從句中的謂語(yǔ)動(dòng)詞形式，來(lái)判斷是對(duì)過(guò)去、現(xiàn)在、將來(lái)三個(gè)時(shí)間里，哪一個(gè)時(shí)間的虛擬假設(shè)，再做題．

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