13．In order to reduce the increasing prices of vegetables，the toll（過路費(fèi)）__________if a truck carrying them passes through a toll station．（　　）
A．cancelsB．is cancelled
C．was cancelledD．had been cancelled

分析 為了減少蔬菜價(jià)格的上漲，如果運(yùn)送蔬菜的卡車通過收費(fèi)站，免過路費(fèi)．

解答 答案是B．本題考查被動(dòng)語態(tài)．根據(jù)句意判斷，所以"the toll"和"cancel（取消）"之間是被動(dòng)關(guān)系；本題描述的是現(xiàn)在的一種客觀狀態(tài)，所以用一般現(xiàn)在時(shí)的被動(dòng)語態(tài)，故選B．

點(diǎn)評 本題考查被動(dòng)語態(tài)，要分析主語和動(dòng)詞之間的關(guān)系，聯(lián)系動(dòng)詞本身的特定用法；在掌握被動(dòng)結(jié)構(gòu)的基本形式"be/get+過去分詞"的基礎(chǔ)上理解不同時(shí)態(tài)的被動(dòng)語態(tài)的結(jié)構(gòu)，最后進(jìn)行綜合判斷．

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