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 這個渡船多年來已用于港口，島之間的旅客運(yùn)輸．

解答 答案是D． 考查被動語態(tài)，本句主語this ferryboat，與動詞use是被動關(guān)系，根據(jù)時間狀語for years"多年來"，判斷為現(xiàn)在完成時的句子，故答案選D．

點(diǎn)評 被動語態(tài)由"助動詞be+及物動詞的過去分詞"構(gòu)成．被動語態(tài)的時態(tài)變化只改變be的形式，過去分詞部分不變．疑問式和否定式的變化也如此．掌握各種時態(tài)的被動語態(tài)是解題的關(guān)鍵．

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