18．This ferryboat _____ to transport passengers between the harbor and the island for years．（　�。�
A．is usedB．was being usedC．is being usedD．has been used

分析 這個(gè)渡船多年來(lái)已用于港口，島之間的旅客運(yùn)輸．

解答 答案是D． 考查被動(dòng)語(yǔ)態(tài)，本句主語(yǔ)this ferryboat，與動(dòng)詞use是被動(dòng)關(guān)系，根據(jù)時(shí)間狀語(yǔ)for years"多年來(lái)"，判斷為現(xiàn)在完成時(shí)的句子，故答案選D．

點(diǎn)評(píng) 被動(dòng)語(yǔ)態(tài)由"助動(dòng)詞be+及物動(dòng)詞的過(guò)去分詞"構(gòu)成．被動(dòng)語(yǔ)態(tài)的時(shí)態(tài)變化只改變be的形式，過(guò)去分詞部分不變．疑問(wèn)式和否定式的變化也如此．掌握各種時(shí)態(tài)的被動(dòng)語(yǔ)態(tài)是解題的關(guān)鍵．

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